php方法傳值和傳引用性能比較
阿新 • • 發佈：2018-10-12
1.0 傳遞 function ++ func fir reac bbb 發的
測試代碼test.php：
<?php function microtime_float() { list($usec, $sec) = explode(" ", microtime()); return ((float)$usec + (float)$sec); } function a($arr) { $data = []; foreach($arr as $var) { $data[] = $var; } return $data; } function b(&$arr) { $data = []; foreach($arr as $var) { $data[] = $var; } return $data; } $arr = [ [ ‘aaa‘ => [ ‘aaa‘=>‘bbb‘, ‘bbb‘=>‘bbb‘, ‘ccc‘=>‘bbb‘, ‘ddd‘=>‘bbb‘, ‘eee‘=>‘bbb‘, ‘fff‘=>‘bbb‘, ‘add‘=>‘bbb‘, ‘dse‘=>‘bbb‘, ‘dad‘=>‘bbb‘, ‘dsa‘=>‘bbb‘, ‘das‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘qer‘=>‘bbb‘, ‘qad‘=>‘bbb‘, ‘asz‘=>‘bbb‘, ‘gda‘=>‘bbb‘, ‘abc‘=>‘bbb‘, ‘vbv‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘tew‘=>‘bbb‘, ], ‘bbb‘ => [ ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>[ ‘aaa‘=>‘bbb‘, ‘bbb‘=>‘bbb‘, ‘ccc‘=>‘bbb‘, ‘ddd‘=>‘bbb‘, ‘eee‘=>‘bbb‘, ‘fff‘=>‘bbb‘, ‘add‘=>‘bbb‘, ‘dse‘=>‘bbb‘, ‘dad‘=>‘bbb‘, ‘dsa‘=>‘bbb‘, ‘das‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘qer‘=>‘bbb‘, ‘qad‘=>‘bbb‘, ‘asz‘=>‘bbb‘, ‘gda‘=>‘bbb‘, ‘abc‘=>‘bbb‘, ‘vbv‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘tew‘=>[ ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>[ ‘aaa‘=>‘bbb‘, ‘bbb‘=>‘bbb‘, ‘ccc‘=>‘bbb‘, ‘ddd‘=>‘bbb‘, ‘eee‘=>‘bbb‘, ‘fff‘=>‘bbb‘, ‘add‘=>‘bbb‘, ‘dse‘=>‘bbb‘, ‘dad‘=>‘bbb‘, ‘dsa‘=>‘bbb‘, ‘das‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘qer‘=>‘bbb‘, ‘qad‘=>‘bbb‘, ‘asz‘=>‘bbb‘, ‘gda‘=>‘bbb‘, ‘abc‘=>‘bbb‘, ‘vbv‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘tew‘=>[ ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>[ ‘aaa‘=>‘bbb‘, ‘bbb‘=>‘bbb‘, ‘ccc‘=>‘bbb‘, ‘ddd‘=>‘bbb‘, ‘eee‘=>‘bbb‘, ‘fff‘=>‘bbb‘, ‘add‘=>‘bbb‘, ‘dse‘=>‘bbb‘, ‘dad‘=>‘bbb‘, ‘dsa‘=>‘bbb‘, ‘das‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘qer‘=>‘bbb‘, ‘qad‘=>‘bbb‘, ‘asz‘=>‘bbb‘, ‘gda‘=>‘bbb‘, ‘abc‘=>‘bbb‘, ‘vbv‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘tew‘=>‘bbb‘, ], ], ], ], ], ], ‘ccc‘ => [ ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>‘bbb‘, ‘caa‘=>[ ‘aaa‘=>‘bbb‘, ‘bbb‘=>‘bbb‘, ‘ccc‘=>‘bbb‘, ‘ddd‘=>‘bbb‘, ‘eee‘=>‘bbb‘, ‘fff‘=>‘bbb‘, ‘add‘=>‘bbb‘, ‘dse‘=>‘bbb‘, ‘dad‘=>‘bbb‘, ‘dsa‘=>‘bbb‘, ‘das‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘qer‘=>‘bbb‘, ‘qad‘=>‘bbb‘, ‘asz‘=>‘bbb‘, ‘gda‘=>‘bbb‘, ‘abc‘=>‘bbb‘, ‘vbv‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘tew‘=>[ ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>‘bbb‘, ‘qaa‘=>[ ‘aaa‘=>‘bbb‘, ‘bbb‘=>‘bbb‘, ‘ccc‘=>‘bbb‘, ‘ddd‘=>‘bbb‘, ‘eee‘=>‘bbb‘, ‘fff‘=>‘bbb‘, ‘add‘=>‘bbb‘, ‘dse‘=>‘bbb‘, ‘dad‘=>‘bbb‘, ‘dsa‘=>‘bbb‘, ‘das‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘qer‘=>‘bbb‘, ‘qad‘=>‘bbb‘, ‘asz‘=>‘bbb‘, ‘gda‘=>‘bbb‘, ‘abc‘=>‘bbb‘, ‘vbv‘=>‘bbb‘, ‘ewq‘=>‘bbb‘, ‘tew‘=>‘bbb‘, ], ], ], ], ] ]; $time = microtime_float(); echo ‘first start: ‘.$time."\n"; //for ($i = 0 ; $i<5000000; $i++) { // // a($arr); //} a($arr); $end = microtime_float(); echo ‘first end:‘.$end."\n"; echo ‘value used:‘.bcsub($end , $time,4); echo "\n"; echo "\n"; echo "\n"; $time = microtime_float(); echo ‘second start:‘.$time."\n"; //for ($i = 0 ; $i<5000000; $i++) { // b($arr); //} b($arr); $end = microtime_float(); echo ‘second end:‘.$end."\n"; echo ‘second used:‘.bcsub($end,$time,4); echo "\n";
測試方法：
watch -n 1 -d php test.php // 輸出 first start: 1539332451.0195 first end:1539332451.0197 value used:0.0002 second start:1539332451.0198 second end:1539332451.0198 second used:0.0000 first start: 1539332463.6168 first end:1539332463.6169 value used:0.0001 second start:1539332463.6169 second end:1539332463.6169 second used:0.0000
結論：
- 傳引用的性能要高於傳值，特別是傳遞的值比較大的時候，性能會很明顯。這是因為傳引用只是復制了地址（一個16進制數）
- 並發的瓶頸一般不會再php，而是在框架、在數據庫。
php方法傳值和傳引用性能比較