PHP function introduction—array_push(): Push elements to the end of the array

PHP function introduction—array_push(): Push elements into the end of the array

In PHP programming, the array is a very commonly used data structure. If we need to add a new element to the end of an existing array, a quick and convenient way is to use the array_push() function. This article will introduce the use of array_push() function in detail and provide code examples.

The syntax of the array_push() function is as follows:
array_push(array &$array, mixed $value1, mixed $value2, ...)

Parameter description:

• &$array: required parameter, specify the array to add elements to.
• $value1, $value2, ...: Required parameters, specifying the elements to be added to the end of the array, which can be one or more.

The following is a practical example of using the array_push() function:

// Create an empty array
$fruits = array();

//Add elements to the array
array_push($fruits, "apple");
array_push($fruits, "banana");
array_push($fruits, "orange") ;

//Output the contents of the array
print_r($fruits);
?>

Running the above code will output the following results:
Array
(

[0] => apple
[1] => banana
[2] => orange

)

As you can see, we use the array_push() function to add "apple", "banana" and "orange" to the end of the $fruits array in sequence. The output shows the added elements and their corresponding indexes.

In addition to adding elements one by one, the array_push() function also supports adding multiple elements at the same time, as shown below:

$numbers = array(1, 2) ;

//Add multiple elements to the array
array_push($numbers, 3, 4, 5);

print_r($numbers);
?>

Running the above code will output the following results:
Array
(

[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5

)

As shown above, we can specify multiple at the same time in the array_push() function elements, separated by commas. In this way, the specified multiple elements will be added to the end of the array in sequence.

It should be noted that the array_push() function will return the length of the new array after execution. Therefore, if we need to get the length of the array after addition, we can assign the return value of the array_push() function to a variable, as follows:

$myArray = array(1, 2);

//Add elements to the array and get the array length
$length = array_push($myArray, "a", "b", "c");

echo "New array length: " . $length;
?>

Running the above code will output the following results:
New array length: 5

In the above example , the array_push() function returns the length of the array $myArray after adding new elements, and assigns it to the variable $length. Finally, we use an echo statement to output the length to the screen.

Summary:
array_push() is a very convenient PHP function that allows us to quickly add one or more elements to the end of an array. By understanding its syntax and usage, we can better utilize this function to simplify code and improve development efficiency.

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