泛舟湖上清波郎朗

功能function?substr_startswith($haystack,?$needle)?{

????return?substr($haystack,?0,?strlen($needle))?===?$needle;}function?preg_match_startswith($haystack,?$needle)?{

????return?preg_match('~'?.?preg_quote($needle,?'~')?.?'~A',?$haystack)?>?0;}function?substr_compare_startswith($haystack,?$needle)?{

????return?substr_compare($haystack,?$needle,?0,?strlen($needle))?===?0;}function?strpos_startswith($haystack,?$needle)?{

????return?strpos($haystack,?$needle)?===?0;}function?strncmp_startswith($haystack,?$needle)?{

????return?strncmp($haystack,?$needle,?strlen($needle))?===?0;}function?strncmp_startswith2($haystack,?$needle)?{

????return?$haystack[0]?===?$needle[0]

??????????strncmp($haystack,?$needle,?strlen($needle))?===?0

????????:?false;}試驗(yàn)echo?'generating?tests';for($i?=?0;?$i?

????if($i?%?2500?===?0)?echo?'.';

????$test_cases[]?=?[

????????random_bytes(random_int(1,?7000)),

????????random_bytes(random_int(1,?3000)),

????];}echo?"done!\n";$functions?=?['substr_startswith',?'preg_match_startswith',?'substr_compare_startswith',?'strpos_startswith',?

????'strncmp_startswith',?'strncmp_startswith2'];$results?=?[];foreach($functions?as?$func)?{

????$start?=?microtime(true);

????foreach($test_cases?as?$tc)?{

????????$func(...$tc);

????}

????$results[$func]?=?(microtime(true)?-?$start)?*?1000;}asort($results);foreach($results?as?$func?=>?$time)?{

????echo?"$func:?"?.?number_format($time,?1)?.?"?ms\n";}結(jié)果(PHP 7.0.9)(排序最快至最慢)strncmp_startswith2:?40.2?ms

strncmp_startswith:?42.9?ms

substr_compare_startswith:?44.5?ms

substr_startswith:?48.4?ms

strpos_startswith:?138.7?ms

preg_match_startswith:?13,152.4?ms結(jié)果(PHP 5.3.29)(排序最快至最慢)strncmp_startswith2:?477.9?ms

strpos_startswith:?522.1?ms

strncmp_startswith:?617.1?ms

substr_compare_startswith:?706.7?ms

substr_startswith:?756.8?ms

preg_match_startswith:?10,200.0?msstartsWith_bench mark.php

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