PHP判断字符串的包含
PHP判断字符串的包含PHP语言是一个功能强大的嵌入式HTML脚本语言,它的易用性让许多程序员选择使用。PHP判断字符串的包含,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。<br>
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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<br>
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代码如下:<br>
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/*如手册上的举例*/<br>
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$email = 'user@example.com';<br>
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$domain = strstr($email, '@');<br>
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echo $domain;<br>
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// prints @example.com<br>
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?><br>
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2. stristr: 它和strstr的使用方法完全一样.唯一的区别是stristr不区分大小写.<br>
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3. strpos: 返回boolean值.FALSE和TRUE不用多说.用 “===”进行判断.strpos在执行速度上都比以上两个函数快,另外strpos有一个参数指定判断的位置,但是默认为空.意思是判断整个字符串.缺点是对中文的支持不好.<br>
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PHP判断字符串的包含代码如下:<br>
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$str= 'abc';<br>
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$needle= 'a';<br>
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$pos = strpos($str, $needle);<br>
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4. 用explode进行判断<br>
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PHP判断字符串的包含代码如下:<br>
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function checkstr($str){<br>
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$needle = "a";//判断是否包含a这个字符<br>
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$tmparray = explode($needle,$str);<br>
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if(count($tmparray)>1){<br>
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return true;<br>
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} else{<br>
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return false;<br>
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}<br>
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}
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