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PHP初记(6) - 数组添加元素

WBOY
WBOYOriginal
2016-06-13 13:03:231005browse

PHP小记(6) - 数组添加元素

今天学到了PHP数组添加一个元素的新方式。

以前总是用push()函数来添加:

$arr = array();
array_push($arr, el1, el2 ... eln);

?

但其实有一种更直接方便的做法:

$arr = array();
$arr[] = el1;
$arr[] = el2;
...
$arr[] = eln;

?

而且有实验证明,第二种方法的效率比第一种方法高出将近一倍!

我们来看下面的例子:

$t = microtime(true); 
$array = array(); 
for($i = 0; $i '; 
$t = microtime(true); 
$array = array(); 
for($i = 0; $i 

<p>运行脚本,结果为:</p>
<p>
</p>
<div class="quote_title">?写道
<div class="quote_div">Run 1 <br>0.0054171085357666 // array_push <br>0.0028800964355469 // array[] <br>Run 2 <br>0.0054559707641602 // array_push <br>0.002892017364502 // array[] <br>Run 3 <br>0.0055501461029053 // array_push <br>0.0028610229492188 // array[]

<p>?</p>
<p>确实长见识了。</p>
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