How to replace a value in an array in php

Replacement steps: 1. Use "array_values($arr)" to convert the specified array into an index array; 2. Use "array_search("specified value", index array)" to search for values ​​and return the corresponding index value; 3. Replace with "array_splice($arr,index,1,"replacement value")".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

php in the replacement array Method of a value

Step 1. Use array_values() to convert the specified array into an index array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array("a"=>"red","b"=>"green","c"=>"blue");
$values=array_values($arr);
var_dump($values);
?>

Step 2. Use array_search() to search for the specified value and return the corresponding index value (key name)

array_search() function searches for a certain key value in the array, and Return the corresponding key name.

$index=array_search("green",$values);
echo $index;

Step 3. Use array_splice() to replace the array value according to the index value.

array_splice($arr, $index, 1, "orange");
var_dump($arr);

Description: array_splice() function

array_splice() function is used to delete some elements of the array; you It can be deleted directly or replaced with other values.

array_splice() syntax is as follows:

array array_splice ( array &$arr, int $start [, int $length = 0 [, mixed $replacement ]] )

Parameter description:

• arr represents an array.
• start indicates the position (subscript) where deletion starts:
  •           If start is a positive number, delete from front to back.
  •             If start is a negative number, start from the position -start from the end of arr and delete it from the back to the front. For example -2 means start from the second to last element of the array.
• length is an optional parameter, indicating the number of elements to delete:
  •           If length is a positive number, it means deleting length elements;
  •           If length is a negative number, then all elements starting from start and counting down to length at the end of the array will be deleted;
  •                    If omitted, all elements starting at start and ending at the end of the array will be deleted.
• replacement is an optional parameter indicating the value to be replaced. If replacement has multiple values, it needs to be set to an array. If there is only one value, it does not need to be set to an array.

If the combination of start and length results in no element being deleted, then the value contained in replacement will be inserted into the position specified by start.

Note that using replacement to replace array elements will not retain the original key names.

Return value: Returns an array consisting of the deleted elements.

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to replace a value in an array in php. For more information, please follow other related articles on the PHP Chinese website!