Specific method of deleting array elements in PHP:
1. Use the unset() method:
Copy the code The code is 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. I wanted to get the last element, but I got blue,
echo $a[1]; //No value
?>
Disadvantage: After deleting elements in the array, the number of elements in the array (obtained with count()) changes, but the array subscripts are not rearranged. You must also use PHP to delete the key before the array element to operate accordingly. value.
2. Use the array_splice() method:
Copy the code The code is 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
? >
Comparing this program with the previous one, you can see that array_splice() not only deletes the elements, but also rearranges the elements so that there will be no null values among the elements of the array!
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