如何灵活运用PHP判断字符串的包含

下面介绍PHP判断字符串的包含的具体使用方法:

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:

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li><span>/*如手册上的举例*/   </span></li>
<li class="alt">
<span>$</span><span class="attribute">email</span><span> = </span><span class="attribute-value">'user@example.com'</span><span>;   </span>
</li>
<li>
<span>$</span><span class="attribute">domain</span><span> = </span><span class="attribute-value">strstr</span><span>($email, '@');   </span>
</li>
<li class="alt"><span>echo $domain; <br>// prints @example.com   </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>

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. 

PHP判断字符串的包含代码如下:

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute">str</span><span>= </span><span class="attribute-value">'abc'</span><span>;   </span></span></li>
<li>
<span>$</span><span class="attribute">needle</span><span>= </span><span class="attribute-value">'a'</span><span>;   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">pos</span><span> = </span><span class="attribute-value">strpos</span><span>($str, $needle);  </span>
</li>
</ol>

4. 用explode进行判断 

PHP判断字符串的包含代码如下:

<ol class="dp-xml">
<li class="alt"><span><span>function checkstr($str){   </span></span></li>
<li>
<span>$</span><span class="attribute">needle</span><span> = </span><span class="attribute-value">"a"</span><span>;//判断是否包含a这个字符   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">tmparray</span><span> = </span><span class="attribute-value">explode</span><span>($needle,$str);   </span>
</li>
<li>
<span>if(count($tmparray)</span><span class="tag">></span><span>1){   </span>
</li>
<li class="alt"><span>return true;   </span></li>
<li><span>} else{   </span></li>
<li class="alt"><span>return false;   </span></li>
<li><span>}   </span></li>
<li class="alt"><span>}  </span></li>
</ol>

以上就是PHP判断字符串的包含的具体代码示例。