How to delete an array element in PHP:
1. Use the Unset () method:
Copy Code code as follows:
<?php
$a =array ("Red", "green", "blue", "yellow");
Count ($a); Get 4
unset ($a [1]); Delete a second element
Count ($a); Get 3
echo $a [2]; There are only three elements in the array, and you want to get the last element, but get blue,
echo $a [1]; No value
?>
Disadvantage: After you delete an element in an array, the number of elements in the array (with count () is changed, but the array subscript is not rearranged, and you must use PHP to delete the key before the array element to manipulate the value.
2. Use the Array_splice () method:
Copy Code code as follows:
<?php
$a =array ("Red", "green", "blue", "yellow");
Count ($a); Get 4
Array_splice ($a, 1, 1); Delete a second element
Count ($a); Get 3
echo $a [2]; Get Yellow
echo $a [1]; Get Blue
?>
This program and the previous comparison, you can see that array_splice () not only deleted the elements, but also the elements of the rearrangement, so that in the middle of the array elements will not have null value!