SplFixedArray::offsetUnset
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplFixedArray::offsetUnset — 指定した添字の値を消去する
パラメータ
index
-
消去したい添字。
戻り値
値を返しません。
エラー / 例外
index
が配列で定義されているサイズの範囲外の場合や
index
を数値として解釈できない場合に
RuntimeException をスローします。
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User Contributed Notes 1 note
c dot 1 at smithies dot org ¶
14 years ago
This function assigns NULL to the array element. Its use has no effect on count(). Whereas assigning NULL to an element will have no effect on isset(), offsetUnset() and unset() do. Whereas unsetting an element affects the behaviour of foreach() as applied to an array or an ArrayObject, it has no such effect on SplFixedArray, as demonstrated by the code below.
<?php
class atest extends SplFixedArray {
public function fill() {
for ($i = $this->count(); --$i >= 0; ) $this[$i] = $i;
}
public function dump() {
$sep = ' ';
foreach ($this as $k => $v) {
echo $sep, "$k: ", (is_null($v) ? 'NULL' : $v);
if (!isset($this[$k])) echo ' and unset';
$sep = ', ';
}
echo PHP_EOL;
}
}
$a = new atest(3);
$a->dump(); // 0: NULL and unset, 1: NULL and unset, 2: NULL and unset
$a->fill();
$a->dump(); // 0: 0, 1: 1, 2: 2
$a[1] = NULL;
unset($a[2]);
$a->dump(); // 0: 0, 1: NULL, 2: NULL and unset
?>
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