php有哪些鲜为人知的技巧?
php有哪些鲜为人知的技巧?
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php有哪些鲜为人知的技巧?
根据我最近一段时间面试情况来看:90%人不知道PHP最新稳定版是5.6。(招聘职位是高级PHP开发)
好吧,来条正经的:ini_get
只能获取到PHP内置和扩展定义的配置,自己添加的自定义配置是无法通过ini_get获取到的。而get_cfg_var
函数可以读取php.ini中自定义的配置键值。
第一条:升级PHP版本5.4-5.6
第二条:anyway
PS:还在用PHP5.2/3的都是在耍流氓。
抖个机灵。
php6其实没什么用。
php -a
可以进交互环境
PHP提供有2个预定义变量用于PHP脚本接收命令行参数:
http://php.net/manual/zh/reserved.variables.php
$argc 传递给脚本的参数个数
$argv[] 传递给脚本的参数数组
getopt可以用于获取命令行参数选项,返回一个参数名和值的关联数组.
http://php.net/manual/zh/function.getopt.php
单独的字符(不接受值)
后面跟随冒号的字符(此选项需要值)
后面跟随两个冒号的字符(此选项的值可选)
<code>#!/png/php/5.4.39NTS/bin/php <?php $argv = getopt('a:b:'); print_r($argv); ?> chmod +x cli.php ./cli.php -a1024 -b2048 或者 php cli.php -a1024 -b2048 </code>
输出:
<code>Array ( [a] => 1024 [b] => 2048 ) </code>
注释掉 $argv = getopt("a:b:")
输出:
<code>Array ( [0] => ./cli.php [1] => -a1024 [2] => -b2048 ) </code>
PHP也可以像Perl那样作为自动化系统管理脚本:
$argv[]存储传递给PHP脚本的参数数组:
http://php.net/manual/zh/reserved.variables.php
PHP提供了众多文件系统操作函数,比如:
http://php.net/manual/zh/ref.filesystem.php
<code>file_exists file_get_contents file_put_contents is_readable is_writable is_executable is_dir mkdir rmdir unlink chmod </code>
PHP也可以像Shell那样很方便地用反撇号`或者shell_exec等调用系统命令,还可以很方便地用popen/proc_open打开管道非阻塞执行命令并获取返回的数据.关键是PHP还内置了超级无敌方便好用的关联数组(哈希表)以及一系列数组操作函数和字符串处理函数,这酸爽,不多说.
常见的是PHP操作Excal 和 压缩包
哈哈 其实手册里面都写到了

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