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<?php
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$times = 200002;
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function isFirstPartOfStrOld ($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 isFirstPartOfStrNew ($str, $partStr) {
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if ($partStr === '') return FALSE;
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if (strpos($str, $partStr, 0) === 0) {
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return TRUE;
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}
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return FALSE;
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}
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function isFirstPartOfStrNew2 ($str, $partStr) {
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return (boolean)($partStr !== '' && strpos($str, $partStr, 0) === 0);
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}
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function isFirstPartOfStrNew3 ($str, $partStr) {
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if ($partStr === '') return FALSE;
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return (strpos($str, $partStr, 0) === 0);
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}
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function test ($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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$time_new_empty = test ('isFirstPartOfStrNew', 'the quick brown fox', '');
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$time_new2_normal = test ('isFirstPartOfStrNew2', 'the quick brown fox', 'the');
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$time_new2_empty = test ('isFirstPartOfStrNew2', 'the quick brown fox', '');
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$time_new3_normal = test ('isFirstPartOfStrNew3', 'the quick brown fox', 'the');
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$time_new3_empty = test ('isFirstPartOfStrNew3', '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 "\nnew2 plain: " . $time_new2_normal;
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echo "\nnew3 plain: " . $time_new3_normal;
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echo "\n----------------------------";
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echo "\ngain : " . number_format((($time_old_normal/$time_new_normal)*100) - 100, 1) . ' %';
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echo "\ngain2 : " . number_format((($time_old_normal/$time_new2_normal)*100) - 100, 1) . ' %';
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echo "\ngain3 : " . number_format((($time_old_normal/$time_new3_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 "\nnew2 empty: " . $time_new2_empty;
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echo "\nnew3 empty: " . $time_new3_empty;
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echo "\n----------------------------";
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echo "\ngain : " . number_format((($time_old_empty/$time_new_empty)*100) - 100, 1) . ' %';
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echo "\ngain2 : " . number_format((($time_old_empty/$time_new2_empty)*100) - 100, 1) . ' %';
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echo "\ngain3 : " . number_format((($time_old_empty/$time_new3_empty)*100) - 100, 1) . ' %';
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echo "\n";
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?>
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