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php split() 函数的用法

Jun 06, 2016 pm 07:46 PM
php split function usage

PHP函数split()的基本语法为:array split ( string $pattern, string $string [, int $limit] )。我们向大家举了两个例子来具体讲解这个函数的使用方法。 对于初学者来说,掌握PHP中常用函数的用法,是其继续学习的基

    PHP函数split()的基本语法为:array split ( string $pattern, string $string [, int $limit] )。我们向大家举了两个例子来具体讲解这个函数的使用方法。

     

    对于初学者来说,掌握PHP中常用函数的用法,是其继续学习的基础。今天我们就为大家详细介绍有关PHP函数split()的一些使用方法,希望大家能通过这篇文章介绍的内容增加自己的知识库。

 

说明
array split ( string $pattern, string $string [, int $limit] )

 

提示
preg_split() 函数使用了 Perl 兼容正则表达式语法,通常是比PHP函数split()更快的替代方案。如果不需要正则表达式的威力,则使用 explode() 更快,这样就不会招致正则表达式引擎的浪费。

本函数返回一个字符串数组,每个单元为 string 经区分大小写的正则表达式 pattern 作为边界分割出的子串。如果设定了 limit,则返回的数组最多包含 limit 个单元,而其中最后一个单元包含了 string 中剩余的所有部分。如果出错,则 split() 返回 FALSE。

将 /etc/passwd 中的前四个字段分割出来:

例 1839. PHP函数split()例子

 

php list($user, $pass, $uid, $gid, $extra=  split (":", $passwd_line, 5);  ?> 

 

 

如果字符串中有 n 个与 pattern 匹配的项目,则返回的数组将包含 n+1 个单元。例如,如果没有找到 pattern,则会返回一个只有一个单元的数组。当然,如果 string 为空也是这样。

解析可能用斜线,点,或横线分割的日期:

例 1840. PHP函数split()例子

 

php 
   
// 分隔符可以是斜线,点,或横线 
   $date = "04/30/1973";  
   
list($month, $day, $year= split ('[/.-]', $date); 
   
echo "Month: $month; Day: $day; Year: $year
\n
";
?> 

 

 

 

想仿效 Perl 中类似的 @chars = split('', $str) 行为,请参考 preg_split() 或 str_split() 函数中的例子。

注意 pattern 是一个正则表达式。如果想要用的分割字符是正则表达式中的特殊字符,要先将其转义。如果觉得PHP函数split()(或其它任何 regex 函数)行为古怪的话,请阅读包含在 PHP 发行包中 regex/ 子目录下的 regex.7 文件。该文件是手册页面格式,可以用类似 man /usr/local/src/regex/regex.7 的命令来阅读

 

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