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PHP删除指定键的数组元素
发布时间:2019-03-13 21:35编辑:admin阅读()
输入: Array
(
[0] => 'G'
[1] => 'E'
[2] => 'E'
[3] => 'K'
[4] => 'S'
)
Key = 2
输出: Array
(
[0] => 'G'
[1] => 'E'
[3] => 'K'
[4] => 'S'
)
使用unset()函数: unset()函数用于从数组中删除元素。unset函数用于销毁任何其他变量,同样用于删除数组的任何元素。此unset命令将数组键作为输入,并从数组中删除该元素。删除后,关联的键和值不会更改。
语法:
unset($variable)
参数:该函数接受单个参数变量。它是必需参数,用于取消设置元素。
程序1:从一维数组中删除元素。
<?php
$arr = array('G', 'E', 'E', 'K', 'S');
print_r($arr);
unset($arr[2]);
print_r($arr);
?>
输出:
Array
(
[0] => G
[1] => E
[2] => E
[3] => K
[4] => S
)
Array
(
[0] => G
[1] => E
[3] => K
[4] => S
)
程序2:从关联数组中删除元素。
<?php
$marks = array(
"Ankit" => array(
"C" => 95,
"DCO" => 85,
),
"Ram" => array(
"C" => 78,
"DCO" => 98,
),
"Anoop" => array(
"C" => 88,
"DCO" => 46,
),
);
echo "删除元素前 <br>";
print_r($marks);
unset($marks["Ram"]);
echo "删除元素后 <br>";
print_r($marks);
?>
输出:
删除元素前
Array
(
[Ankit] => Array
(
[C] => 95
[DCO] => 85
)
[Ram] => Array
(
[C] => 78
[DCO] => 98
)
[Anoop] => Array
(
[C] => 88
[DCO] => 46
)
)
删除元素后
Array
(
[Ankit] => Array
(
[C] => 95
[DCO] => 85
)
[Anoop] => Array
(
[C] => 88
[DCO] => 46
)
)