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PHP函数sizeof()的具体使用语法详解

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Release: 2016-06-13 11:06:39
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大家通过对PHP函数sizeof()语法:

sizeof(arrayname);

提示和说明

注:此功能可能会返回0 ,如果一个变量没有设置,但也可能返回0 ,如果一个变量包含一个空数组。该isset ( )函数可以用来测试一个变量是否设置。

下面我们就来看看PHP函数sizeof()的实例吧。

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">people</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span>("a", "Joe", "b", "C");  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">result</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">sizeof</font></span><span>($people);  </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span>echo $result;  </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>
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输出结果为:4

从上例中我们可以看出,PHP函数sizeof()与count方法是一样的。


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