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run code in 300+ PHP versions simultaneously
<?php $a = <<< EOT Improve the efficiency of php code 2 favorites New one: php programmers easy to commit 10 errors | old one: PHP code optimization The this essay translation finishing brightest from the network documentation (see last reference) in multiple PHP Conference is the Ilia Alshanetsky admiration in speech, mainly all kinds of techniques to improve PHP performance. For the sake of precision, many parts have detailed the efficiency of the data, as well as the corresponding version and so on. Lazy, data is not one given directly to the conclusion, if you need to see the original document, please go to the end "References" section. The orange title for the recommended part. ================================================== ====== Members must be called statically defined as static (PHP5 ONLY) Tips: PHP 5 introduces the concept of static members, the role and function of PHP 4 internal static variables, but the former is as a member of the class to use. Static variables and class variables in Ruby (class variable) almost all instances of a class share the same static variable. Static call non-static member, efficiency 50-60% slower than statically call the static member. Mainly because the former will produce E_STRICT warning, the internal need to do the conversion. Use class constants (PHP5 ONLY) Tips: PHP 5 new features, similar to C + + const. The benefits of using the class constant is: - Resolved at compile time, there is no overhead - The hash table is smaller, faster internal lookup - Class constants exist only in a particular namespace, so the hash name shorter - The code is cleaner and more convenient to make debugging Do not use require / include_once (temporarily) require / include_once each call will open the target file! - If you use absolute path, PHP 5.2/6.0 there is no problem - The new version of the the APC cache system has to solve this problem File I / O => increase in efficiency is reduced If necessary, you can inspect the files yourself is to require / include. Do not call meaningless function Corresponding constant, do not use the function. Although the use of small, but the efficiency about 3500%. The fastest Win32 check - Do not function - Win98/NT/2000/XP/Vista/Longhorn/Shorthorn/Whistler ... General - Has been available A matter of time (PHP> 5.1.0 ONLY) You know how your software now? Simple "time (), time () again, you ask me ...". But I fear, will call the function, slow. Well now, do not call the function, but also save a. Acceleration PCRE - Without saving the results, do not (), all (? :) This PHP do not comply with the contents of the allocated memory, Province. Efficiency about 15%. - Do not have a regular, do not have regular, carefully read the manual "String Functions" section in the analysis. There is no useful function that you missed? For example: The strpbrk () strncasecmp () strpos () / strrpos () / stripos () / strripos () Acceleration strtr If you need to convert all single character string instead of an array do strtr: Efficiency: 10 times. Do not do unnecessary replacement Even if it is not replaced the str_replace also its parameter assignment memory. Very slow! The solution: - Strpos first find (very fast) to see if it needs to be replaced, if necessary, replace Efficiency: - If you need to replace: the efficiency is almost equal to the difference of about 0.1%. - If you do not need to replace: strpos 200% faster. Evil @ operator Do not abuse the @ operator. @ Looks very simple, but in fact there are a lot of background operation. @ @ Than without, the efficiency gap: three times. Especially not in the loop using the @ 5 cycles of testing, even with error_reporting (0) to turn off the error, and then the cycle is complete, open, than fast @. Efficient use of strncmp Need to compare the "before" n characters strncmp / strncasecmp and not substr / pass through strtolower more not PCRE, more 10 million indescribably ereg. strncmp / the strncasecmp efficient (although not much). EOT; $start_time = array_sum(explode(" ", microtime())); for ($i = 0; $i < 10000; $i++) { str_replace("strncmp", "[replaced]", $a); } echo $Runtime = "runtime:" . ((array_sum(explode(" ", microtime())) - $start_time) * 1000) . "Ms";
Output for 7.4.1
runtime:67.821979522705Ms
Output for 7.4.0
runtime:68.046092987061Ms
Output for 7.3.13
runtime:68.714141845703Ms
Output for 7.3.12
runtime:68.209171295166Ms
Output for 7.3.11
runtime:67.355155944824Ms
Output for 7.3.10
runtime:45.24302482605Ms
Output for 7.3.9
runtime:61.077833175659Ms
Output for 7.3.8
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Output for 7.3.7
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Output for 7.3.6
runtime:56.163787841797Ms
Output for 7.3.5
runtime:45.408010482788Ms
Output for 7.3.4
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Output for 7.3.3
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Output for 7.3.2
runtime:45.298099517822Ms
Output for 7.3.1
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Output for 7.3.0
runtime:48.415899276733Ms
Output for 7.2.26
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Output for 7.2.25
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Output for 7.2.24
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Output for 7.2.23
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Output for 7.2.21
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Output for 7.2.20
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Output for 7.2.19
runtime:62.981128692627Ms
Output for 7.2.18
runtime:46.623945236206Ms
Output for 7.2.17
runtime:45.374155044556Ms
Output for 5.6.40, 7.2.16
runtime:48.277139663696Ms
Output for 7.2.15
runtime:64.173936843872Ms
Output for 7.2.14
runtime:45.025110244751Ms
Output for 7.2.13
runtime:49.391031265259Ms
Output for 7.2.12
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Output for 7.2.11
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Output for 7.2.10
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Output for 7.2.9
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Output for 7.2.8
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Output for 7.2.7
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Output for 7.2.6
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Output for 7.2.5
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Output for 7.2.4
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Output for 7.2.3
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Output for 7.2.2
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Output for 7.2.1
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Output for 7.2.0
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Output for 7.1.33
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Output for 7.1.28
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Output for 7.1.27
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Output for 7.1.19
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Output for 7.1.18
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Output for 7.1.17
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Output for 7.1.16
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Output for 7.1.15
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Output for 7.1.14
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Output for 7.1.13
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Output for 7.1.12
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Output for 7.1.11
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Output for 7.1.10
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Output for 7.1.9
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Output for 7.1.8
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Output for 7.1.7
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Output for 7.1.6
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Output for 7.1.5
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Output for 7.1.4
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Output for 7.1.3
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Output for 7.1.2
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Output for 7.1.1
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Output for 7.1.0
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Output for 7.0.33
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Output for 7.0.32
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Output for 5.6.8, 7.0.31
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Output for 7.0.30
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Output for 7.0.29
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Output for 7.0.28
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Output for 7.0.27
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Output for 7.0.26
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Output for 7.0.25
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Output for 7.0.24
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Output for 7.0.23
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Output for 7.0.22
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Output for 7.0.21
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Output for 7.0.20
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Output for 7.0.19
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Output for 7.0.18
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Output for 7.0.17
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Output for 7.0.16
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Output for 7.0.15
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Output for 7.0.14
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Output for 7.0.13
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Output for 7.0.12
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Output for 7.0.11
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Output for 7.0.10
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Output for 7.0.9
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Output for 7.0.8
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Output for 7.0.6
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Output for 7.0.2
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Output for 7.0.1
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Output for 7.0.0
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Output for 5.6.39
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Output for 5.6.38
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Output for 5.4.25, 5.6.37
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Output for 5.6.36
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Output for 5.6.35
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Output for 5.6.34
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Output for 5.6.33
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Output for 5.6.32
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Output for 5.6.31
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Output for 5.6.30
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Output for 5.6.29
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Output for 5.6.28
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Output for 5.6.27
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Output for 5.6.26
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Output for 5.6.25
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Output for 5.6.24
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Output for 5.6.23
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Output for 5.6.22
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Output for 5.6.20
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Output for 5.6.19
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Output for 5.6.18
runtime:63.786029815674Ms
Output for 5.6.17
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Output for 5.6.16
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Output for 5.6.15
runtime:49.172878265381Ms
Output for 5.6.14
runtime:52.290916442871Ms
Output for 5.6.13
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Output for 5.6.12
runtime:82.294940948486Ms
Output for 5.6.11
runtime:52.330017089844Ms
Output for 5.6.10
runtime:47.886848449707Ms
Output for 5.6.9
runtime:68.055868148804Ms
Output for 5.6.7
runtime:51.680088043213Ms
Output for 5.6.6
runtime:64.712047576904Ms
Output for 5.6.5
runtime:55.140972137451Ms
Output for 5.6.4
runtime:48.725128173828Ms
Output for 5.6.3
runtime:50.539970397949Ms
Output for 5.6.2
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Output for 5.6.1
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Output for 5.6.0
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Output for 5.5.38
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Output for 5.5.37
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Output for 5.5.36
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Output for 5.5.35
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Output for 5.5.33
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Output for 5.5.32
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Output for 5.5.31
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Output for 5.5.30
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Output for 5.5.29
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Output for 5.5.28
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Output for 5.5.27
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Output for 5.5.26
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Output for 5.5.25
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Output for 5.5.24
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Output for 5.5.23
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Output for 5.5.22
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Output for 5.5.21
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Output for 5.5.20
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Output for 5.5.19
runtime:48.369884490967Ms
Output for 5.5.18
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Output for 5.5.17
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Output for 5.5.16
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Output for 5.5.15
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Output for 5.5.14
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Output for 5.5.13
runtime:65.485000610352Ms
Output for 5.5.12
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Output for 5.5.11
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Output for 5.5.10
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Output for 5.5.9
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Output for 5.5.8
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Output for 5.5.7
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Output for 5.5.6
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Output for 5.5.5
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Output for 5.5.4
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Output for 5.5.3
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Output for 5.5.2
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Output for 5.5.1
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Output for 5.5.0
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Output for 5.4.45
runtime:57.251930236816Ms
Output for 5.4.44
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Output for 5.4.28, 5.4.43
runtime:52.901983261108Ms
Output for 5.4.42
runtime:47.960996627808Ms
Output for 5.4.41
runtime:49.84188079834Ms
Output for 5.4.40
runtime:62.328100204468Ms
Output for 5.4.39
runtime:51.099061965942Ms
Output for 5.4.38
runtime:48.218011856079Ms
Output for 5.4.37
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Output for 5.4.36
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Output for 5.4.35
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Output for 5.4.34
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Output for 5.4.33
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Output for 5.4.32
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Output for 5.4.31
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Output for 5.4.30
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Output for 5.4.29
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Output for 5.4.27
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Output for 5.4.26
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Output for 5.4.24
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Output for 5.4.23
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Output for 5.4.22
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Output for 5.4.21
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Output for 5.4.20
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Output for 5.4.19
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Output for 5.4.18
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Output for 5.4.17
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Output for 5.4.16
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Output for 5.4.15
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Output for 5.4.14
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Output for 5.4.13
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Output for 5.4.12
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Output for 5.4.11
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Output for 5.4.10
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Output for 5.4.9
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Output for 5.4.8
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Output for 5.4.7
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Output for 5.4.6
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Output for 5.4.5
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Output for 5.4.4
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Output for 5.4.3
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Output for 5.4.2
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Output for 5.4.1
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Output for 5.4.0
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Output for 5.3.29
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Output for 5.3.28
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Output for 5.3.27
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Output for 5.3.26
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Output for 5.3.25
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Output for 5.3.24
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Output for 5.3.23
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Output for 5.3.22
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Output for 5.3.21
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Output for 5.3.20
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Output for 5.3.19
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Output for 5.3.18
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Output for 5.3.17
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Output for 5.3.16
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Output for 5.3.15
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Output for 5.3.14
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Output for 5.3.13
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Output for 5.3.12
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Output for 5.3.11
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Output for 5.3.10
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Output for 5.3.9
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Output for 5.3.8
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Output for 5.3.7
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Output for 5.3.6
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Output for 5.3.5
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Output for 5.3.4
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Output for 5.3.3
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Output for 5.3.2
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Output for 5.3.1
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Output for 5.3.0
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Output for 5.2.17
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Output for 5.2.16
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Output for 5.2.15
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Output for 5.2.14
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Output for 5.2.13
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Output for 5.2.12
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Output for 5.2.11
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Output for 5.2.10
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Output for 5.2.9
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Output for 5.2.8
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Output for 5.2.7
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Output for 5.2.6
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Output for 5.2.5
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Output for 5.2.4
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Output for 5.2.3
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Output for 5.2.2
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Output for 5.2.1
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Output for 5.2.0
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Output for 5.1.6
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Output for 5.1.5
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Output for 5.1.4
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Output for 5.1.3
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Output for 5.1.2
runtime:32.035112380981Ms
Output for 5.1.1
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Output for 5.1.0
runtime:31.164169311523Ms
Output for 5.0.5
runtime:52.531003952026Ms
Output for 5.0.4
runtime:34.503936767578Ms
Output for 5.0.3
runtime:42.214870452881Ms
Output for 5.0.2
runtime:33.0650806427Ms
Output for 5.0.1
runtime:32.508850097656Ms
Output for 5.0.0
runtime:31.764030456543Ms
Output for 4.4.9
runtime:20.742893218994Ms
Output for 4.4.8
runtime:25.747060775757Ms
Output for 4.4.7
runtime:23.789882659912Ms
Output for 4.4.6
runtime:20.853996276855Ms
Output for 4.4.5
runtime:20.334959030151Ms
Output for 4.4.4
runtime:19.711017608643Ms
Output for 4.4.3
runtime:20.231008529663Ms
Output for 4.4.2
runtime:19.185066223145Ms
Output for 4.4.1
runtime:19.3030834198Ms
Output for 4.4.0
runtime:19.631862640381Ms
Output for 4.3.11
runtime:20.221948623657Ms
Output for 4.3.10
runtime:20.439863204956Ms
Output for 4.3.9
runtime:20.180940628052Ms
Output for 4.3.8
runtime:19.806861877441Ms
Output for 4.3.7
runtime:20.181894302368Ms
Output for 4.3.6
runtime:20.450115203857Ms
Output for 4.3.5
runtime:21.806955337524Ms
Output for 4.3.4
runtime:29.424905776978Ms
Output for 4.3.3
runtime:21.450996398926Ms
Output for 4.3.2
runtime:19.500017166138Ms
Output for 4.3.1
runtime:19.527196884155Ms
Output for 4.3.0
runtime:17.711162567139Ms
preferences:
227.73 ms | 401 KiB | 325 Q