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run code in 150+ php & hhvm versions
Bugs & Features
<?php /** strrev function implementation taken from ext/standard/string.c PHP-5-5 branch http://lxr.php.net/xref/PHP_5_5/ext/standard/string.c#3165 // {{{ proto string strrev(string str) // Reverse a string PHP_FUNCTION(strrev) { char *str; char *e, *n, *p; int str_len; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) { return; } n = emalloc(str_len+1); p = n; e = str + str_len; while (--e>=str) { *p++ = *e; } *p = '\0'; RETVAL_STRINGL(n, str_len, 0); } // }}} */ // PHP Implementation function userland_strrev($string) { if (!is_string($string)) { return false; } $new_string = ""; $len = strlen($string); while (--$len > -1) { $new_string .= $string[$len]; } return $new_string; } $string = "Hello PHP!"; $c = 1000; $results = array(); $tests = array('strrev', 'userland_strrev'); foreach ($tests as $test) { for ($i = 0; $i < $c; $i++) { $t = microtime(true); $test($string); $results[$test] = microtime(true) - $t; } $avg = array_sum($results[$test]) / count($results[$test]); printf("Average cost for function $test: %.6f ms\n", $avg); }
Output for 7.0.0 - 7.1.0
Warning: array_sum() expects parameter 1 to be array, float given in /in/fCTge on line 62 Average cost for function strrev: 0.000000 ms Warning: array_sum() expects parameter 1 to be array, float given in /in/fCTge on line 62 Average cost for function userland_strrev: 0.000000 ms
Output for hhvm-3.12.0
Warning: Invalid operand type was used: array_sum expects an array or collection as argument 1 in /in/fCTge on line 62 Average cost for function strrev: 0.000000 ms Warning: Invalid operand type was used: array_sum expects an array or collection as argument 1 in /in/fCTge on line 62 Average cost for function userland_strrev: 0.000000 ms
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.6.21
Warning: array_sum() expects parameter 1 to be array, double given in /in/fCTge on line 62 Average cost for function strrev: 0.000000 ms Warning: array_sum() expects parameter 1 to be array, double given in /in/fCTge on line 62 Average cost for function userland_strrev: 0.000000 ms
Output for 4.3.2 - 5.2.17
Warning: array_sum(): The argument should be an array in /in/fCTge on line 62 Average cost for function strrev: 0.000000 ms Warning: array_sum(): The argument should be an array in /in/fCTge on line 62 Average cost for function userland_strrev: 0.000000 ms
Output for 4.3.0 - 4.3.1
Warning: array_sum() [http://www.php.net/function.array-sum]: The argument should be an array in /in/fCTge on line 62 Average cost for function strrev: 0.000000 ms Warning: array_sum() [http://www.php.net/function.array-sum]: The argument should be an array in /in/fCTge on line 62 Average cost for function userland_strrev: 0.000000 ms