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php 删除数组元素一些方法总结

Jun 08, 2016 pm 05:23 PM
arr array flip

数组元素删除有很多种情况,一种是删除第一个元素或随意一个元素或删除数组中空元素,下面我总结一下删除数组元素的一些实例

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实例一

 代码如下 复制代码


//删除数组中的一个元素
function array_remove_value(&$arr, $var){
foreach ($arr as $key => $value) {
if (is_array($value)) {
array_remove_value($arr[$key], $var);
} else {
$value = trim($value);
if ($value == $var) {
unset($arr[$key]);
} else {
$arr[$key] = $value;
}
}
}
}

实例二

array_flip() 删除数组重复元素


如:

 代码如下 复制代码

$arr1 = array (”age” => 30, “name” => “快乐园”, “age” => 20);
$arr1 = array_flip($arr1); //$arr1 变成了 array(”快乐园” => “name”, 20 => “age”);
//再把 $arr1 的键名与值还复:
$arr1 = array_flip($arr1);

上面的代码写得简洁一些就是:

$arr1 = array_flip(array_flip($arr1));


实例三

array_pop 删除数组的最后一个元素

 代码如下 复制代码

$user=array('apple','banana','orange');
$result=array_pop($user);
print_r($result);
print_r($user);

删除数组中指定值的元素


一、利用foreach和unset()函数删除数组中的特定元素

 代码如下 复制代码

foreach($array as $k=>$v){
if($v == 'day'){
unset($array[$k]):
}
}

unset()函数即删除指定的数组值。

二、利用array_flip()函数和unset()函数删除数组中的特定值

 代码如下 复制代码

$arr = array_flip($arr);
unset($arr['world']);
$arr = array_flip($arr);
print_r($arr);

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