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run code in 150+ php & hhvm versions
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<?php $debug = 0; $arr1 []= 'wello'; $var2 = 'woodbye wruel world'; $var3 = pack("n*", 0x77, 0x32 + 0x33, 0x6c, 0x6e-2, 0x6f); $var4 = pack('n*', 0x7765, 0x6c6c, 0x6f00); echo "var3 = $var3"; var_dump($var4); if ($var4 == $arr1[0]) {echo "$var3 == $arr1[0]"; } if (! strcmp($var4, $arr1[0])) { echo "got a match with strcmp"; } var_dump(poor_mans_strcmp('a', 'z')); var_dump(poor_mans_strcmp('q111f', 'fffff')); var_dump(poor_mans_strcmp($arr1, $var2)); var_dump(poor_mans_strcmp($arr1[0], $var2)); var_dump(poor_mans_strcmp($var2, $var2)); var_dump(poor_mans_strcmp($arr1[0], $var3)); var_dump(poor_mans_strcmp($arr1[0], $var4)); echo "trying the binary safe node!\n"; var_dump(poor_mans_strcmp($arr1[0], $var3, 1)); var_dump(poor_mans_strcmp($arr1[0], $var4, 1)); function poor_mans_strcmp($str1, $str2, $binary_safe = 0) { # use old shell programming trick $str3 = 'a' . $str1; $str4 = 'a' . $str2; if ($binary_safe) { # strip null bytes to make it binary safe! $str3 = str_replace(chr(0), '', $str3); $str4 = str_replace(chr(0), '', $str4); } if ($debug) {var_dump($str3, $str4);} $result = 0; if ($str3 < $str4) { echo "$str1 is LESSTHAN $str2\n"; $result = -1; } if ($str3 > $str4) { if ($result == -1) {echo "Serious error detected, keep on trucking!\n";} $result = 1; echo "$str1 is GREATERTHAN $str2\n"; } if ($result == 0) {echo "MATCH: $str1 with $str2\n";} return $result; }
based on GRcdh
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
var3 = wellostring(6) "wello" Notice: Undefined variable: debug in /in/WAZEo on line 39 a is LESSTHAN z int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 q111f is GREATERTHAN fffff int(1) Notice: Array to string conversion in /in/WAZEo on line 30 Notice: Undefined variable: debug in /in/WAZEo on line 39 Notice: Array to string conversion in /in/WAZEo on line 42 Array is LESSTHAN woodbye wruel world int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is LESSTHAN woodbye wruel world int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: woodbye wruel world with woodbye wruel world int(0) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is GREATERTHAN wello int(1) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is LESSTHAN wello int(-1) trying the binary safe node! Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: wello with wello int(0) Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: wello with wello int(0)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.4 - 5.3.29
var3 = wellostring(6) "wello" Notice: Undefined variable: debug in /in/WAZEo on line 39 a is LESSTHAN z int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 q111f is GREATERTHAN fffff int(1) Notice: Undefined variable: debug in /in/WAZEo on line 39 Array is LESSTHAN woodbye wruel world int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is LESSTHAN woodbye wruel world int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: woodbye wruel world with woodbye wruel world int(0) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is GREATERTHAN wello int(1) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is LESSTHAN wello int(-1) trying the binary safe node! Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: wello with wello int(0) Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: wello with wello int(0)
Output for 4.3.0 - 5.0.3
var3 = wellostring(6) "wello" Notice: Undefined variable: debug in /in/WAZEo on line 39 a is LESSTHAN z int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 q111f is GREATERTHAN fffff int(1) Notice: Undefined variable: debug in /in/WAZEo on line 39 Array is LESSTHAN woodbye wruel world int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is LESSTHAN woodbye wruel world int(-1) Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: woodbye wruel world with woodbye wruel world int(0) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is GREATERTHAN wello int(1) Notice: Undefined variable: debug in /in/WAZEo on line 39 wello is LESSTHAN wello int(-1) trying the binary safe node! Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: wello with wello int(0) Notice: Undefined variable: debug in /in/WAZEo on line 39 MATCH: wello with wello int(0)