php测试性能代码
function microtime_float () { list ( $usec , $sec ) = explode ( " " , microtime()); return ((float) $usec + (float) $sec ); } function echotime ( $name ) { static $t_start = 0; $t_end = microtime_float(); if ( $name != 'start' ) { $time = $t_end - $t_start ; echo ( $name . ':' ); echo intval ( $time * 1000); echo "<br>\n" ; } $t_start = $t_end ; } $index = 1000; $loop = 10000; $length = 10000; $key = "abc" . $index ; $array = array (); for ( $i = 0; $i < $length ; $i ++) { $array [ 'abc' . $i ] = 'abc' . $i ; } echotime( 'start' ); for ( $i = 0; $i < $loop ; $i ++) { if ( array_key_exists ( $key , $array )) { $a = true; } } echotime( 'array_key_exists' ); for ( $i = 0; $i < $loop ; $i ++) { if (isset( $array [ $key ])) { $a = true; } } echotime( 'isset' ); for ( $i = 0; $i < $loop ; $i ++) { if (in_array( $key , $array )) { $a = true; } } echotime( 'in_array' ); for ( $i = 0; $i < $loop ; $i ++) { if ( array_search ( $key , $array )) { $a = true; } } echotime( 'array_search' ); $array2 = array_flip ( $array ); for ( $i = 0; $i < $loop ; $i ++) { if (isset( $array2 [ $key ])) { $a = true; } } echotime( 'flip and search' ); $array2 = $array ; foreach ( $array2 as $k => $v ) { $array2 [ $k ] = strtoupper ( $v ); } echotime( 'foreach1' ); $array2 = $array ; foreach ( $array2 as & $v ) { $v = strtoupper ( $v ); } echotime( 'foreach2' ); $array2 = $array ; $array2 = array_map ( 'strtoupper' , $array2 ); echotime( 'array_map' );查看更多关于php测试性能代码 - php高级应用的详细内容...
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