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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 284 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]

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php删除数组元素示例分享 - 站长搜索
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php删除数组元素示例分享

PHP 2014-12-01 23:34:03 转载来源: 网络整理/侵权必删

本文为大家讲解的是php删除数组元素示例分享,感兴趣的同学参考下. PHP删除数组元素的具体方法: 1

本文为大家讲解的是php删除数组元素示例分享,感兴趣的同学参考下.

PHP删除数组元素的具体方法:

1.用unset()方法:


<?php
$a=array("red", "green", "blue", "yellow");  
count($a); //得到4  
unset($a[1]); //删除第二个元素  
count($a); //得到3  
echo $a[2]; //数组中仅有三个元素,本想得到最后一个元素,但却得到blue,  
echo $a[1]; //无值  
?>

缺点:删除数组中的元素后,数组中的元素个数(用count()得到)变了,但数组下标却没有重新排列,还必须用PHP删除数组元素前的key来操作相应的值.

2.用array_splice()方法:


<?php
$a=array("red", "green", "blue", "yellow");  
count ($a); //得到4  
array_splice($a,1,1); //删除第二个元素  
count ($a); //得到3  
echo $a[2]; //得到yellow  
echo $a[1]; //得到blue
?>

这个程序和前一个相对比,就可以看到,array_splice()不仅删除了元素,还把元素重排了,这样在数组各元素中间就不会有空值!


标签: php 删除 数组 元素 示例 分享


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