Several methods of removing array elements in PHP _php tutorial

Several methods of removing array elements in PHP in many cases our arrays will be duplicated, then we can delete some of the duplicate contents of the array what to do, these elements I have to keep his only, so I want to delete them, the following is the use of traversal query to remove the repeating array elements of several methods.

Several PHP tutorials Remove array element methods
In many cases our arrays will be duplicated, then we can delete some of the duplicate contents of the array what to do, these elements I have to keep his only, so I want to delete them, the following is the use of traversal query to remove the repeating array elements of several methods.

See a complete delete duplicate array instance

To delete an element in an array
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;
}
}
}
}

$a is an array:
Count ($a); Get 4
unset ($a [1]); Delete the second element
Count ($a); Get 3
echo $a [2]; There are only three elements in the array, and I wanted to get the last element, but I got blue,
echo $a [1]; No value
?>
That is, after the elements in the array are deleted, the number of elements in the array (with count () is changed, but the array subscript is not rearranged, and the corresponding value must be manipulated with the key before the array is deleted.
Later I used another method, in fact, is not called "method", is to use PHP4 ready-made function Array_splice ().
Count ($a); Get 4
Array_splice ($a, 1, 1); Delete the second element
Count ($a); Get 3
echo $a [2]; Get Yellow
echo $a [1]; Get Blue
?>

Method Two

function to delete repeating elements in an array
Function Delmember (& $array, $id)
{
$size = count ($array);
for ($i = 0; $i < $size-$id-1; $i + +)
{
$array [$id + $i] = $array [$id + $i + 1];
}
Unset ($array [$size-1]);
}

For more detailed information, please see: http://www.bkjia.com/phper/php-function/34794.htm

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