Some commonly used PHP array functions

Array is a commonly used data type in PHP. In order to facilitate the operation and processing of arrays, PHP provides many built-in array functions. This article will introduce some commonly used PHP array functions.

1. array() function

array() function is a function that creates an array in PHP. Its syntax is as follows:

array(value1,value2,value3. ..)

Where value1, value2, value3... are values, which can be any PHP variable type.

Example:

$fruits = array("apple", "banana", "orange");
$numbers = array(1, 2, 3, 4, 5) ;

2. count() function

The count() function is a function in PHP used to return the number of array elements. Its syntax is as follows:

count( array_name)

where array_name is the array whose number of elements needs to be calculated.

Example:

$fruits = array("apple", "banana", "orange");
echo count($fruits); //Output 3

3. Sort() function

The sort() function is a function in PHP used to sort arrays. Its syntax is as follows:

sort(array_name,sort_type)

array_name is the array that needs to be sorted, sort_type indicates the sorting method, and the value can be SORT_REGULAR, SORT_NUMERIC or SORT_STRING.

Example:

$numbers = array(1, 5, 3, 7, 2);
sort($numbers);
print_r($numbers); // Output Array ([0] => 1 [1] => 2 [2] => 3 [3] => 5 [4] => 7 )

4. shuffle() Function

shuffle() function is a function in PHP used to randomly sort arrays. Its syntax is as follows:

shuffle(array_name)

where array_name needs to be random Sorted array.

Example:

$numbers = array(1, 5, 3, 7, 2);
shuffle($numbers);
print_r($numbers); // Output Array ([0] => 7 [1] => 3 [2] => 1 [3] => 2 [4] => 5 )

5. array_merge() Function

array_merge() function is a function in PHP used to merge multiple arrays into a new array. Its syntax is as follows:

array_merge(array1,array2,array3... )

Among them, array1, array2, array3... are the arrays that need to be merged.

Example:

$array1 = array("name"=>"Tom","age"=>20);
$array2 = array("name"= >"Jerry","age"=>21);
$new_array = array_merge($array1,$array2);
print_r($new_array); //Output Array ( [name] => Jerry [age] => 21 )

6. in_array() function

The in_array() function is a function in PHP used to determine whether a value exists in an array. The syntax is as follows:

in_array(value,array_name)

where value is the value to be found and array_name is the array to be found.

Example:

$fruits = array("apple", "banana", "orange");
if(in_array("banana", $fruits)){

echo "找到了！";

} else {

echo "没找到！";

}

7. array_search() function

array_search() function is used in PHP to find a value in an array and A function that returns its key name. Its syntax is as follows:

array_search(value,array_name)

where value is the value to be searched, and array_name is the array to be searched.

Example:

$fruits = array("apple", "banana", "orange");
echo array_search("banana", $fruits); //Output 1

The above is an introduction to some PHP array functions. These functions can help us process arrays more conveniently and improve the development efficiency and quality of PHP.

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