How to remove numeric index from array in php

Removal method: 1. Define a string array "$keys". The elements of this array are all strings. The number of elements is the same as the array "$arr" that needs to be processed; 2. Use "array_combine( $keys,$arr)" statement removes the numeric index in the "$arr" array and converts the numeric index into a string index.

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

In PHP, you can use the array_combine() function To remove the numeric index in the array and convert the numeric index into a string index.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array("red","green","blue","yellow");
var_dump($arr);

$keys=array("a","b","c","d");
echo "使用array_combine()去除数字索引后:";
var_dump(array_combine($keys,$arr));
?>

Output result:

Let’s take a look at the array_combine() function.

array_combine() function creates a new array by merging two arrays, where the elements of one array are key names and the elements of the other array are key values.

Syntax:

array_combine($keys,$values)

The elements in the $keys array serve as the keys of the new array, and the elements of the $values ​​array serve as the keys of the new array.

But it should be noted that when using the array_combine() function to create an array, the number of elements in the $keys array and the $values ​​array must be consistent, so that the key names and key values ​​can correspond one to one, otherwise An error will be reported and FALSE will be returned.

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