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<?php
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$times = 5000;
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function isFirstPartOfStrNew ($str, $partStr) {
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if ($partStr === '') return false;
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if (strpos($str, $partStr, 0) === 0) {
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return true;
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}
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return false;
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}
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function isFirstPartOfStrOld ($str, $partStr) {
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$psLen = strlen($partStr);
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if ($psLen) {
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return substr($str, 0, $psLen) == (string)$partStr;
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} else return false;
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}
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function test ($function, $a, $b) {
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global $times;
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$time_start = microtime(true);
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for ($i = 0; $i < $times; $i++) {
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$function($a, $b);
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}
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return (microtime(true) - $time_start);
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}
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$time_old_normal = test ('isFirstPartOfStrOld', 'the quick brown fox', 'the');
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$time_old_empty = test ('isFirstPartOfStrOld', 'the quick brown fox', '');
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$time_new_normal = test ('isFirstPartOfStrNew', 'the quick brown fox', 'the');
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$time_new_empty = test ('isFirstPartOfStrNew', 'the quick brown fox', '');
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echo "old plain: " . $time_old_normal;
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echo "\nnew plain: " . $time_new_normal;
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echo "\n----------------------------";
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echo "\ngain : " . number_format((($time_old_normal/$time_new_normal)*100) - 100, 1) . ' %';
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echo "\n";
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echo "\nold empty: " . $time_old_empty;
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echo "\nnew empty: " . $time_new_empty;
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echo "\n----------------------------";
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echo "\ngain : " . number_format((($time_old_empty/$time_new_empty)*100) - 100, 1) . ' %';
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echo "\n";
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?>
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