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php字符函数strstr,strpos,stristr使用方法 - 站长搜索
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php字符函数strstr,strpos,stristr使用方法

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2014-12-13 10:51:06 转载来源: 网络整理/侵权必删

本文为大家讲解的是php中的字符串查找函数strstr,strpos,stristr的使用方法,感兴趣的同学参考下. php判断字符以及字符串的包含,可以使用PHP的内置函数strstr,strpos,stristr直接进行判断

本文为大家讲解的是php中的字符串查找函数strstr,strpos,stristr使用方法,感兴趣的同学参考下.

php判断字符以及字符串的包含,可以使用PHP的内置函数strstr,strpos,stristr直接进行判断.也可以通过explode函数的作用写一个判断函数
下面介绍使用方法:

1. strstr: 返回一个从被判断字符开始到结束的字符串,如果没有返回值,则不包含
 

<?php
/*如手册上的举例*/
$email = 'user@example.com';
$domain = strstr($email, '@');
echo $domain; // prints @example.com

?>


2. stristr: 它和strstr的使用方法完全一样.唯一的区别是stristr不区分大小写.

3. strpos: 返回boolean值.FALSE和TRUE不用多说.用 “===”进行判断.strpos在执行速度上都比以上两个函数快,另外strpos有一个参数指定判断的位置,但是默认为空.意思是判断整个字符串.缺点是对中文的支持不好.使用方法


$str= 'abc';
$needle= 'a';
$pos = strpos($str, $needle);


4. 用explode进行判断

 

 


function checkstr($str){
$needle = "a";//判断是否包含a这个字符
$tmparray = explode($needle,$str);
if(count($tmparray)>1){
return true;
} else{
return false;
}
}

 

 


标签: php 字符 函数 strstr strpos stristr 使用方法


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