PHP array_search()で連想配列の特定の値を削除するサンプル
環境
PHP 8.1.2
Ubuntu 22.04.1 LTS
構文
if (($key = array_search(削除する値, $対象の配列)) !== false) {
unset($arr[$key]);
}
array_search()を使って連想配列(associative array)の特定の値を削除するには、unset()を使います。
引数1は削除したい値を指定し、第２引数に対象の連想配列を指定します。
使用例
<?php
$ns = [
"k1" => 21,
"k2" => 32,
"k3" => 43,
"k4" => 54,
"k5" => 65,
];
print ("before\n");
print_r($ns);
if (($key = array_search(2, $ns)) !== false) {
unset($ns[$key]);
}
print("after\n");
print_r($ns);
?>
<?php
$ns = [
"k1" => 21,
"k2" => 32,
"k3" => 43,
"k4" => 54,
"k5" => 65,
];
print ("before\n");
print_r($ns);
if (($key = array_search(2, $ns)) !== false) {
unset($ns[$key]);
}
print("after\n");
print_r($ns);
?>
<?php
$ns = [
"k1" => 21,
"k2" => 32,
"k3" => 43,
"k4" => 54,
"k5" => 65,
];
print ("before\n");
print_r($ns);
if (($key = array_search(2, $ns)) !== false) {
unset($ns[$key]);
}
print("after\n");
print_r($ns);
?>
実行結果
before
Array
(
[k1] => 21
[k2] => 32
[k3] => 43
[k4] => 54
[k5] => 65
)
after
Array
(
[k1] => 21
[k2] => 32
[k3] => 43
[k4] => 54
[k5] => 65
)
before
Array
(
[k1] => 21
[k2] => 32
[k3] => 43
[k4] => 54
[k5] => 65
)
after
Array
(
[k1] => 21
[k2] => 32
[k3] => 43
[k4] => 54
[k5] => 65
)
before
Array
(
[k1] => 21
[k2] => 32
[k3] => 43
[k4] => 54
[k5] => 65
)
after
Array
(
[k1] => 21
[k2] => 32
[k3] => 43
[k4] => 54
[k5] => 65
)