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php unset删除数组变量实现方法

Jun 13, 2016 am 11:18 AM
phpunsetanddeleteusevariableexistaccomplishWorkdataarraymethodwant

要删除数据与变量在php中利用工作之便unset就可以实现了,当然也可以利用空也处理,不过销毁变量,让php变量在内存中消失哦。  

要删除数据与变量在php教程中利用工作之便unset就可以实现了,当然也可以利用空也处理,不过销毁变量,让php变量在内存中消失哦。
*/

$array = array('aa'=>1,'bb'=>2);

function delete(&$array, $key)
{
 if (!is_array($key)) {
  $key = array($key);
 }
 foreach ($key as $k) {
  unset($array[$k]);
 }
 $array = array_values($array);
}


print_r(array_values($array));

print_r(delete($array,'aa'));

/*
unset();
该函数允许取消一个数组中的键名。要注意数组将不会重建索引。
$a = array( 1 => 'one', 2 => 'two', 3 => 'three' );
unset( $a[2] );
/* 将产生一个数组,定义为
$a = array( 1=>'one', 3=>'three');
而不是
$a = array( 1 => 'one', 2 => 'three');
清空整个数组
unset($arr);
4:清空指定元素
unset($arr[index]);
unset() 销毁指定的变量。注意在php 3 中,unset() 将返回true(实际上是整型值1),
而在php 4 中,unset() 不再是一个真正的函数:它现在是一个语句


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