How to delete array elements and reorder them in php

php method to delete array elements and reorder: first use the unset() function to delete the specified element in the array; then use the array_values() function to reorder. The array_values() function can reset the array information, and the key values ​​of the array will be rearranged starting from 0.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php deletes array elements and reorders them

<?php
$arr1 = array(1,3, 5,7,8);
var_dump($arr1);
foreach ($arr1 as $key=>$value)
{
  if ($value === 3)
    unset($arr1[$key]);
}
$arr2 =array_values($arr1);
var_dump($arr2);
?>

Output:

array (size=5)
  0 => int 1
  1 => int 3
  2 => int 5
  3 => int 7
  4 => int 8
  
array (size=4)
  0 => int 1
  1 => int 5
  2 => int 7
  3 => int 8

Related function introduction:

unset: Release the given variable

unset ( mixed $var [, mixed $... ] ) : void

unset() Destroys the specified variable. The behavior within the function will vary depending on the type of variable you want to destroy.

If you unset() a global variable in a function, only the local variable will be destroyed, and the variables in the calling environment will maintain the same value before calling unset().

array_values: Returns all the values ​​in the array

array_values ( array $array ) : array

array_values() Returns all the values ​​in the input array and creates a numerical index for them.

• Parameter array array.

• Return value, return the index array containing all values.

Tip: The returned array will use numeric keys, starting at 0 and increasing by 1.

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