How to set the array header in php (two methods)

In PHP, the array header can be set in two ways. One is to use the array function and the other is to use square brackets.

Use the array function to set the array header

The array function is a commonly used built-in function in PHP for creating arrays. You can use the array function to create an empty array and add elements to it to set the array header.

For example, the following code creates an empty array and adds two elements to it:

$array = array();
$array[0] = 'apple';
$array[1] = 'banana';

This sets two elements at the head of the array: 'apple' and 'banana'.

In addition, you can also add elements at once when creating the array, as shown below:

$array = array('apple', 'banana');

This will also set two elements at the head of the array: 'apple' and 'banana'.

Use square brackets to set the array header

In addition to using the array function, you can also use square brackets to directly set the array header.

For example, the following code creates an empty array and adds an element to it:

$array = [];
$array[0] = 'apple';

This sets an element at the head of the array: 'apple'.

In addition, you can also add elements at once when creating the array, as shown below:

$array = ['apple', 'banana'];

This will also set two elements at the head of the array: 'apple' and 'banana'.

Summary

In PHP, you can use the array function or square brackets to set the head of an array. To use the array function, you need to first create an empty array and add elements to it; while using square brackets, you can add elements directly to the array. Either way, the head of the array can be flexibly set to meet different needs.

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