How to add array elements to an array in php

4 ways to add: 1. Add directly through the array name, syntax "$array[subscript] = 'element value';"; 2. Use array_push() to add to the end of the array of the first parameter One or more elements, syntax "array_push(array, value 1, value 2...)"; 3. array_fill() fills the array with the given value; 4. array_merge() merges two or more arrays into one Array, that is, insert the elements of the next array to the end of the previous array.

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

There are many methods built into php to communicate with the array Add array elements, let’s learn about it below.

Method 1. Directly add

<?php
header("Content-type:text/html;charset=utf-8");
$array = array(&#39;test1&#39;, &#39;test2&#39;);
var_dump($array);

$array[] = &#39;test3&#39;;
//或
$array[&#39;name&#39;] = &#39;jack&#39;;
var_dump($array);
?>

Method 2. Use array_push() to add the first Add one or more elements to the end of the parameter array

Syntaxarray_push(array,value1,value2...)

Parameter description

• array required. Specifies an array.

• value1Required. Specifies the value to add.

• value2 Optional. Specifies the value to add.

<?php
header("Content-type:text/html;charset=utf-8");
$a=array("Dog","Cat");
var_dump($a);

echo array_push($a,"Horse","Bird");//注意返回值为新的数组元素的个数
var_dump($a);
?>

Method 3. Use array_fill() to fill the array with the given value

Syntaxarray_fill(start,number,value)

Parameter description

• start is required. A numeric value specifying the starting index of the key.

• number required. Numeric value specifies the amount of padding, and its value must be greater than 0.

• value is required. Specifies the value to be inserted.

<?php
header("Content-type:text/html;charset=utf-8");
$a=array_fill(2,3,"Dog");
var_dump($a);
?>

Method 4, array_merge() merges two or more arrays into one array

If there are duplicate key names, the key value of the key will be the value corresponding to the last key name (the later one will overwrite the previous one). If the array is numerically indexed, the key names are re-indexed consecutively.

Note: If only an array is input to the array_merge() function, and the key name is an integer, the function will return a new array with integer key names, and the key names will be re-indexed starting from 0.

Syntax array_merge(array1,array2,array3...)

Parameter description

• ##array1 is required. The first array of input.

• array2 required. The second array of input.

• array3 Optional. Multiple input arrays can be specified.

<?php
header("Content-type:text/html;charset=utf-8");
$a1=array("a"=>"Horse","b"=>"Dog");
$a2=array("c"=>"Cow","d"=>"Cat");
var_dump($a1);
var_dump(array_merge($a1,$a2));
?>

Note: In a PHP array, the key name (key) is unique; if there are duplicate key names, the value corresponding to the subsequent key name Will overwrite the previous value.

<?php
header("Content-type:text/html;charset=utf-8");
$a1=array("a"=>"Horse","b"=>"Dog");
$a2=array("c"=>"Cow","b"=>"Cat");
var_dump($a1);
var_dump(array_merge($a1,$a2));
?>

Recommended learning: "

PHP Video Tutorial"

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