How to remove array key value in php

php method to remove array key values: 1. Use the "array_keys($array)" statement to remove all key values ​​and return an array containing all key names; 2. Use "array_splice($array,$ start,$length)" statement can remove one or more key values ​​at the specified position.

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

There are many ways to remove array key values ​​in php , two methods are introduced below:

Method 1: Use array_keys() function

array_key() function can get some or all key names in the array.

Use the array_key() function to remove all key values ​​​​from the array and return a new array containing all key names.

Usage syntax:

array_keys($array)

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array("Name"=>"Peter","Age"=>"41","Country"=>"USA");
var_dump($arr);
$keys=array_keys($arr);
var_dump($keys);
?>

##Method 2: Use array_splice() function

array_slice() function is used to intercept an array, that is, to extract a fragment from the array

Usage syntax:

array_splice($array,$start,$length)

Parameters:

• array represents the array to be intercepted.

start indicates the starting position (subscript) of interception:
• If start is a positive number, interception is performed from front to back.
  • If start is a negative number, start from the position -start from the end of arr and intercept from back to front. For example -2 means start from the second to last element of the array.
length is an optional parameter, indicating the intercepted length:
• If length is a positive number, it indicates the number of intercepted elements;
  • If length If it is a negative number, then the intercepted fragment will end at the length position from the end of the array;
  • If it is omitted, it will start from the start position and continue to the end of the array.

Use the array_splice() function to remove one or more key values ​​at the specified position.

Example 1:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20,25,24);
echo "原数组：";
var_dump($arr);

echo "删除后的数组：" ;
array_splice($arr,2);
var_dump($arr);
?>

Example 2:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20,25,24);
echo "原数组：";
var_dump($arr);

echo "删除后的数组：" ;
array_splice($arr,2,-1);
var_dump($arr);
?>

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