How to master the correct posture of using array_push() function

When using PHP, have you ever wanted to insert elements into an array but didn't know how to do it? I believe you must have it. At this time, we should write an important function. I believe everyone has heard of it, and that is the array_push() function.

As we all know, there are two ways to insert functions into arrays in PHP. One is to use array_unshift, and the other is our protagonist array_push function today. (Recommended: PHP function array array function video explanation)

array_push() function can add one or more elements (push) to the end of the array of the first parameter (push), and then return The length of the new array. Using this function is equivalent to calling $array[] = $value multiple times.

Looking at the syntax directly, I believe many people can't read it. This time we change to a more relaxed way. We look at the syntax while looking at the code, which is much easier.

Let’s take a look at this example first

<?php
$a=array("red","green");
array_push($a,"blue","yellow");
print_r($a);
?>

In this example, we first define an array, then we use the array_push function, and then write in the first parameter of this function For the already defined array, write the elements that need to be added in the second, third, and even subsequent parameters. In this way, we will get an array with new elements. At this time, let us see if our judgment is correct. .

Array ( [0] => red [1] => green [2] => blue [3] => yellow )

Yes, that's right, as we judged, two elements "blue" and "yellow" were added to the original array in order.

At this time we have a general understanding of this function, let us study this function systematically.

Syntax

array_push(array,value1,value2...)

array——is the previously defined array

value——is the element we need to add, it can be one or multiple

Of course there are points to note:

• Even if there are string key names in the array, the elements you add are always numeric keys.

• If you use array_push() to add a unit to the array, it is better to use $array[] =, because there is no additional burden of calling the function.

• array_push() will issue a warning if the first argument is not an array. This is different from the behavior of $var[], which creates a new array.

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