php判断字符以及字符串的包孕方法属性

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Release: 2016-06-13 10:54:33
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php判断字符以及字符串的包含方法属性

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?

代码如下:
?
???? /*如手册上的举例*/?
???? $email = [email protected]';?
??? $domain = strstr($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?
代码如下:
$str= 'abc';?
$needle= 'a';?
$pos = strpos($str, $needle);?

4. 用explode进行判断 代码如下:
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;?
??? }?
}?

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