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01.// 两个默认参数的函数 02.function foo($arg1 = ”, $arg2 = ”) { 03.echo “arg1: $arg1\n”; 04.echo “arg2: $arg2\n”; 05.} 06.foo(‘hello’,'world’); 07./* 输出: 08.arg1: hello 09.arg2: world 10.*/ 11.foo(); 12./* 输出: 13.arg1: 14.arg2: 15.*/ 16.下面这个示例是PHP的不定参数用法，其使用到了 func_get_args()方法： 17.// 是的，形参列表为空 18.function foo() { 19.// 取得所有的传入参数的数组 20.$args = func_get_args(); 21.foreach ($args as $k => $v) { 22.echo “arg”.($k+1).”: $v\n”; 23.} 24.} 25.foo(); 26./* 什么也不会输出 */ 27.foo(‘hello’); 28./* 输出 29.arg1: hello 30.*/ 31.foo(‘hello’, ‘world’, ‘again’); 32./* 输出 33.arg1: hello 34.arg2: world 35.arg3: again 36.*/01.// 取得所有的后缀为PHP的文件 02.$files = glob(‘*.php’); 03.print_r($files); 04./* 输出: 05.Array 06.( 07.[0] => phptest.php 08.[1] => pi.php 09.[2] => post_output.php 10.[3] => test.php 11.) 12.*/01.// 取PHP文件和TXT文件 02.$files = glob(‘*.{php,txt}’, GLOB_BRACE); 03.print_r($files); 04./* 输出: 05.Array 06.( 07.[0] => phptest.php 08.[1] => pi.php 09.[2] => post_output.php 10.[3] => test.php 11.[4] => log.txt 12.[5] => test.txt 13.) 14.*/01.$files = glob(‘../images/a*.jpg’); 02.print_r($files); 03./* 输出: 04.Array 05.( 06.[0] => ../images/apple.jpg 07.[1] => ../images/art.jpg 08.) 09.*/01.$files = glob(‘../images/a*.jpg’); 02.// applies the function to each array element 03.$files = array_map(‘realpath’,$files); 04.print_r($files); 05./* output looks like: 06.Array 07.( 08.[0] => C:\wamp\www\images\apple.jpg 09.[1] => C:\wamp\www\images\art.jpg 10.) 11.*/01.echo “Initial: “.memory_get_usage().” bytes \n”; 02./* 输出 03.Initial: 361400 bytes 04.*/ 05.// 使用内存 06.for ($i = 0; $i < 100000; $i++) { 07.$array []= md5($i); 08.} 09.// 删除一半的内存 10.for ($i = 0; $i < 100000; $i++) { 11.unset($array[$i]); 12.} 13.echo “Final: “.memory_get_usage().” bytes \n”; 14./* prints 15.Final: 885912 bytes 16.*/ 17.echo “Peak: “.memory_get_peak_usage().” bytes \n”; 18./* 输出峰值 19.Peak: 13687072 bytes 20.*/01.print_r(getrusage()); 02./* 输出 03.Array 04.( 05.[ru_oublock] => 0 06.[ru_inblock] => 0 07.[ru_msgsnd] => 2 08.[ru_msgrcv] => 3 09.[ru_maxrss] => 12692 10.[ru_ixrss] => 764 11.[ru_idrss] => 3864 12.[ru_minflt] => 94 13.[ru_majflt] => 0 14.[ru_nsignals] => 1 15.[ru_nvcsw] => 67 16.[ru_nivcsw] => 4 17.[ru_nswap] => 0 18.[ru_utime.tv_usec] => 0 19.[ru_utime.tv_sec] => 0 20.[ru_stime.tv_usec] => 6269 21.[ru_stime.tv_sec] => 0 22.) 23.*/01.// sleep for 3 seconds (non-busy) 02.sleep(3); 03.$data = getrusage(); 04.echo “User time: “. 05.($data['ru_utime.tv_sec'] + 06.$data['ru_utime.tv_usec'] / 1000000); 07.echo “System time: “. 08.($data['ru_stime.tv_sec'] + 09.$data['ru_stime.tv_usec'] / 1000000); 10./* 输出 11.User time: 0.011552 12.System time: 0 13.*/01.// loop 10 million times (busy) 02.for($i=0;$i<10000000;$i++) { 03.} 04.$data = getrusage(); 05.echo “User time: “. 06.($data['ru_utime.tv_sec'] + 07.$data['ru_utime.tv_usec'] / 1000000); 08.echo “System time: “. 09.($data['ru_stime.tv_sec'] + 10.$data['ru_stime.tv_usec'] / 1000000); 11./* 输出 12.User time: 1.424592 13.System time: 0.004204 14.*/01.$start = microtime(true); 02.// keep calling microtime for about 3 seconds 03.while(microtime(true) – $start < 3) { 04.} 05.$data = getrusage(); 06.echo “User time: “. 07.($data['ru_utime.tv_sec'] + 08.$data['ru_utime.tv_usec'] / 1000000); 09.echo “System time: “. 10.($data['ru_stime.tv_sec'] + 11.$data['ru_stime.tv_usec'] / 1000000); 12./* prints 13.User time: 1.088171 14.System time: 1.675315 15.*/1.// this is relative to the loaded script’s path 2.// it may cause problems when running scripts from different directories 3.require_once(‘config/database.php’); 4.// this is always relative to this file’s path 5.// no matter where it was included from 6.require_once(dirname(__FILE__) . ‘/config/database.php’);01.// some code 02.// … 03.my_debug(“some debug message”, __LINE__); 04./* 输出 05.Line 4: some debug message 06.*/ 07.// some more code 08.// … 09.my_debug(“another debug message”, __LINE__); 10./* 输出 11.Line 11: another debug message 12.*/ 13.function my_debug($msg, $line) { 14.echo “Line $line: $msg\n”; 15.}01.// generate unique string 02.echo uniqid(); 03./* 输出 04.4bd67c947233e 05.*/ 06.// generate another unique string 07.echo uniqid(); 08./* 输出 09.4bd67c9472340 10.*/01.// 前缀 02.echo uniqid(‘foo_’); 03./* 输出 04.foo_4bd67d6cd8b8f 05.*/ 06.// 有更多的熵 07.echo uniqid(”,true); 08./* 输出 09.4bd67d6cd8b926.12135106 10.*/ 11.// 都有 12.echo uniqid(‘bar_’,true); 13./* 输出 14.bar_4bd67da367b650.43684647 15.*/01.// 一个复杂的数组 02.$myvar = array( 03.‘hello’, 04.42, 05.array(1,’two’), 06.‘apple’ 07.); 08.// 序列化 09.$string = serialize($myvar); 10.echo $string; 11./* 输出 12.a:4:{i:0;s:5:”hello”;i:1;i:42;i:2;a:2:{i:0;i:1;i:1;s:3:”two”;}i:3;s:5:”apple”;} 13.*/ 14.// 反序例化 15.$newvar = unserialize($string); 16.print_r($newvar); 17./* 输出 18.Array 19.( 20.[0] => hello 21.[1] => 42 22.[2] => Array 23.( 24.[0] => 1 25.[1] => two 26.) 27.[3] => apple 28.) 29.*/01.// a complex array 02.$myvar = array( 03.‘hello’, 04.42, 05.array(1,’two’), 06.‘apple’ 07.); 08.// convert to a string 09.$string = json_encode($myvar); 10.echo $string; 11./* prints 12.["hello",42,[1,"two"],”apple”] 13.*/ 14.// you can reproduce the original variable 15.$newvar = json_decode($string); 16.print_r($newvar); 17./* prints 18.Array 19.( 20.[0] => hello 21.[1] => 42 22.[2] => Array 23.( 24.[0] => 1 25.[1] => two 26.) 27.[3] => apple 28.) 29.*/01.$string = 02.“Lorem ipsum dolor sit amet, consectetur 03.adipiscing elit. Nunc ut elit id mi ultricies 04.adipiscing. Nulla facilisi. Praesent pulvinar, 05.sapien vel feugiat vestibulum, nulla dui pretium orci, 06.non ultricies elit lacus quis ante. Lorem ipsum dolor 07.sit amet, consectetur adipiscing elit. Aliquam 08.pretium ullamcorper urna quis iaculis. Etiam ac massa 09.sed turpis tempor luctus. Curabitur sed nibh eu elit 10.mollis congue. Praesent ipsum diam, consectetur vitae 11.ornare a, aliquam a nunc. In id magna pellentesque 12.tellus posuere adipiscing. Sed non mi metus, at lacinia 13.augue. Sed magna nisi, ornare in mollis in, mollis 14.sed nunc. Etiam at justo in leo congue mollis. 15.Nullam in neque eget metus hendrerit scelerisque 16.eu non enim. Ut malesuada lacus eu nulla bibendum 17.id euismod urna sodales. “; 18.$compressed = gzcompress($string); 19.echo “Original size: “. strlen($string).”\n”; 20./* 输出原始大小 21.Original size: 800 22.*/ 23.echo “Compressed size: “. strlen($compressed).”\n”; 24./* 输出压缩后的大小 25.Compressed size: 418 26.*/ 27.// 解压缩 28.$original = gzuncompress($compressed);
