How to remove elements from one-dimensional array in php

Removal method: 1. Use array_shift() to delete the first element, the syntax is "array_shift(array)". 2. Use array_pop() to delete the last element, the syntax is "array_pop(array)". 3. Use array_splice() to delete the specified number of elements starting from the specified position. The syntax is "array_splice(array, position, number);". 4. Use array_slice() to delete elements and retain the specified number of elements starting from the specified position.

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php removes one dimension 4 methods of array elements

1. Use the array_shift() function

array_shift() function is used to delete the first element in the array element and returns the deleted element. Note: This function can change the original array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(1,2,3,4,5,6,7,8,9);
var_dump($arr);
array_shift($arr);
var_dump($arr);
?>

2. Use array_pop() function

array_pop() function to delete the last element in the array. Note: This function can change the original array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(1,2,3,4,5,6,7,8,9);
var_dump($arr);
array_pop($arr);
var_dump($arr);
?>

3. Use array_splice() function

array_splice() function can delete the specified number of elements starting from the specified position. . Note: This function can change the original array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20,25,24);
echo "原数组：";
var_dump($arr);
echo "从第二元素开始删除1个元素：" ;
array_splice($arr,1,1);
var_dump($arr);

echo "从第三元素开始删除2个元素：" ;
$arr=array(10,12,20,25,24);
array_splice($arr,2,2);
var_dump($arr);
?>

The third parameter of this function can be omitted, then all remaining elements will be deleted.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20,25,24);
echo "原数组：";
var_dump($arr);
echo "从第3元素开始删除全部元素：" ;
array_splice($arr,2);
var_dump($arr);
?>

Method 4: Use array_slice() function

array_slice() function is a function provided by PHP for intercepting arrays Function that extracts a fragment from an array and returns it.

In other words, the array_slice() function can retain the specified number of elements starting from the specified position, and delete other elements.

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

echo "截取的数组片段：";
$result = array_slice($arr,2); //截取从下标2开始的全部数组元素
var_dump($result);

$result = array_slice($arr,1,2); //截取从下标1开始的两个元素
var_dump($result);
?>

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