How to get several pieces of data in an array in php

Two methods: 1. Use array_slice() to intercept the specified number of data from the specified position, the syntax is "array_slice(array, starting position, number)"; 2. Use array_splice() to start from the specified position Intercept all data, the syntax is "array_slice(array, starting position)".

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

php gets the array Methods for one or more pieces of data

• Use the array_slice() function

• Use the array_splice() function

1. Use array_slice() function

array_slice() function is a function provided by PHP to intercept arrays and can be extracted from arrays. A fragment. Let's take a look at the array_slice() function:

array_slice($array,$start,$length,$preserve)

This function supports 2 required parameters: $array and $start, two parameters that can be omitted $length and $preserve.

Parameter$arrayNo need to introduce it, parameter$start is used to specify the position (subscript) to start interception, parameter$ length represents the interception length (if omitted, it will be intercepted from the specified subscript to the end of the 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 "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);

?>

The output result is:

The parameter $start has 3 values:

## If
• # is 0 and

• is a positive number, it will be intercepted from front to back. If

• is a negative number, it will start from the position

  -start from the end of $array (that is, positioning from the right side of the array to the left according to the absolute value), starting from the back Cut forward. For example -2 means starting from the second to last element of the 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 "截取的数组片段：";
$result = array_slice($arr,2);
var_dump($result);

$result = array_slice($arr,-2);
var_dump($result);
?>

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$length also has 3 values:

• If length is a positive number, it indicates the number of intercepted elements;

• If length is a negative number, then the intercepted fragment will end in the distance array The position of the end length;

• If omitted, it will be intercepted from the start position to the end of the 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 "截取的数组片段：";
$result = array_slice($arr,1,1);
var_dump($result);

$result = array_slice($arr,1,-1);
var_dump($result);
?>

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2. Use array_splice() function## The #array_splice() function can combine these deleted elements into a new array when deleting some elements of the array, and then return this new array.

Use

The function can intercept the specified length ( $length value) array fragment. Let’s take a look at the following small example:

<?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：";
$result = array_splice($arr,2);  //截取从下标2开始的全部数组元素
var_dump($result);

$arr = array(10,12,20,25,24);
$result = array_splice($arr,1,2);//截取从下标1开始的两个元素
var_dump($result);

?>