PHP Delete array elements sample share _php tutorial

PHP deletes the array elements in a specific way:

1. Using the Unset () method:
Copy the Code code as follows:
$a =array ("Red", "green", "blue", "yellow");
Count ($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
?>

Cons: After deleting an element in an array, 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 by removing the key from the array element before PHP.

2. Using the Array_splice () method:
Copy the Code code as follows:
$a =array ("Red", "green", "blue", "yellow");
Count ($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
?>

This program is relative to the previous one, and you can see that array_splice () not only removes the element, but also rearrange the elements so that there will be no null values in the middle of each element of the array!

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