How to remove elements from an array in php?

php method to remove elements from an array: 1. Use the unset function to delete an element and keep the original index unchanged; 2. Use the [array_splice] function to delete an element without keeping the index; 3. Use the [array_diff] function to delete multiple elements by value, keeping the index.

php method to remove elements from an array:

1. Delete an element and keep it original The index remains unchanged

Use theunsetfunction, the example is as follows:

 "a", 1 => "b", 2 => "c"); unset($array[1]); //↑ 你想删除的key ?>

Output:

Array ( [0] => a [2] => c )

Using unset does not change the original value of the array There is an index. If you plan to rearrange the index (let the index start from 0 and be continuous), you can use thearray_valuesfunction:

$array = array_values($array); /* 输出 array(2) { [0]=> string(1) "a" [1]=> string(1) "c"} */

2. Delete an element without keeping the index

Use thearray_splicefunction, the example is as follows:

 "a", 1 => "b", 2 => "c"); array_splice($array, 1, 1); //↑ 你想删除的元素的Offset ?>

Output:

Array ( [0] => a [1] => c )

3. Delete multiple elements by value, keeping the index

Use thearray_difffunction, the example is as follows:

 "a", 1 => "b", 2 => "c"); $array = array_diff($array, ["a", "c"]); //└────────┘→ 你想删除的数组元素值values ?>

Output:

Array ( [1] => b )

Similar to unset,array_diffwill also be maintained index.

4. Delete multiple elements by key and keep the index

Use thearray_diff_keyfunction, the example is as follows:

 "a", 1 => "b", 2 => "c"); $array = array_diff_key($array, [0 => "xy", "2" => "xy"]); //↑ ↑ 你想删除的数组键keys ?>

Output:

Array ( [1] => b )

Similar to unset,array_diff_keywill also maintain the index.

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