What are the functions in php array

php array functions include: 1. count(): function; 2. array_push() function; 3. array_pop() function; 4. array_shift() function; 5. array_unshift() function; 6. array_slice () function, array_merge() function, array_key_exists() function, array_search() function, etc.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP is a widely used server-side scripting language with powerful array processing capabilities. PHP provides many functions for operating and processing arrays. These functions can complete common array operations quickly and efficiently. This article will introduce the commonly used array functions in PHP and give a brief explanation of them.

1. count(): This function is used to return the number of elements in the array. It can accept an array as a parameter and return the number of elements in the array. For example:

$numbers=array(1,2,3,4,5);
$count=count($numbers);
echo$count;//输出：5

2. array_push(): This function is used to add one or more elements to the end of an array. It accepts an array as the first argument and passes the elements to be added as subsequent arguments. For example:

$fruits=array("apple","banana");
array_push($fruits,"orange","grape");
print_r($fruits);//输出：Array([0]=>apple[1]=>banana[2]=>
orange[3]=>grape)

3. array_pop(): This function is used to delete and return the last element of the array. It accepts an array as parameter and returns the removed elements. For example:

$fruits=array("apple","banana","orange");
$lastFruit=array_pop($fruits);
echo$lastFruit;//输出：orange

4. array_shift(): This function is used to delete and return the first element of the array. It accepts an array as parameter and returns the removed elements. For example:

$fruits=array("apple","banana","orange");
$firstFruit=array_shift($fruits);
echo$firstFruit;//输出：apple

5. array_unshift(): This function is used to add one or more elements to the beginning of an array. It accepts an array as the first argument and passes the elements to be added as subsequent arguments. For example:

$fruits=array("banana","orange");
array_unshift($fruits,"apple","grape");
print_r($fruits);//输出：Array([0]=>apple[1]=>grape[2]=>
banana[3]=>orange)

6. array_slice(): This function is used to extract a portion of elements from an array and return a new array. It accepts an array as the first argument, a starting index as the second argument, and an optional length as the third argument. For example:

$fruits=array("apple","banana","grape","orange");
$slice=array_slice($fruits,1,2);
print_r($slice);//输出：Array([0]=>banana[1]=>grape)

The above are only a small part of the PHP array functions. There are many other useful functions, such as array_merge(), array_key_exists(), array_search(), etc. By becoming familiar with these functions, we can process and operate arrays more efficiently and improve the development efficiency of PHP programs.

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