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PHP Array Functions
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PHP Array Functions

Last Updated : 14 Apr, 2025
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Arrays are one of the fundamental data structures in PHP. They are widely used to store multiple values in a single variable and can store different types of data, such as strings, integers, and even other arrays. PHP offers a large set of built-in functions to perform various operations on arrays. These functions make array manipulation in PHP easier and more efficient.

In this article, we will discuss the commonly used PHP array functions.

Installation: The array functions do not require any installation.

The complete list of Array Functions is given below:

PHP Array Functions

Description

php array_all

Determines if all elements in the array satisfy a given condition via a callback function.

array_any

Checks if at least one element in the array satisfies a condition through a callback function.

array_change_key_case

Changes the case of all array keys, converting them to either lowercase or uppercase.

array_chunk()Split an array into parts or chunks of a given size.

array_column

Returns values from a single column of a multidimensional array, specified by key.

array_combine()Create a new array by using one array for keys and another array for values.
 array_count_values() Count all the values inside an array.
array_diff_assoc()Gets the difference between one or more arrays (including keys).
array_diff_keys()Get the difference between one or more arrays. 
array_diff_uassoc()Compare the keys and values of the user-defined function.
array_diff_ukey()Compares the key to two or more arrays 
array_diff() Calculate the difference between two or more arrays. 
 array_fill_keys()Create a new array filled with the given keys and value provided as an array to the function.
array_fill()Fill an array with values.
array_filter() Filter the elements of an array using a user-defined function.
array_flip()Exchange elements within an array
array_intersect_assoc()Compute the intersection of two or more arrays.
array_intersect_key()Compute the intersection of two or more arrays.
array_intersect_uassoc()Compare key and values of two or more arrays 
array_intersect()Compares the values of two or more arrays and returns the matches.
array_key_exists()Check whether a specific key or index is present inside an array or not.
array_keys()Return either all the keys of an array or the subset of the keys.
array_merge_recursive()Merge two or more arrays into a single array recursively. 
array_multisort()Sort multiple arrays at once or a multi-dimensional array with each are dimension.
array_pad()Pad a value fixed number of time onto an array.
array_pop()Delete or pop out and return the last element from an array passed to it as a parameter.
array_product()Calculates the product of all values in an array.
array_push()Push new elements into an array.
array_rand() Fetch a random number of elements from an array.
array_reduce() Reduce the elements of an array into a single value
array_replace_recursive()Replaces the values of the first array with the values
array_replace()It takes a list of arrays separated by commas (,) as parameters 
array_reverse()Reverse the elements of an array, user's including the nested arrays.
array_search() Search for a particular value in an array
array_shift()Shifts an element off from the beginning in an array.
array_slice()Fetch a part of an array by slicing through it, according to the user'sfor choice.
array_splice()Replaces the existing element with elements from other arrays and returns an array 
array_sum()It takes an array parameter and returns the sum of all the values in it.
array_udiff_assoc()The function computes the difference arrays from two or more arrays
array_udiff()Distinguishing between two or more arrays.
array_uintersect_assoc()Compute the intersection of the array of keys for different values of two or more arrays.
array_uintersect_uassoc() Computes the intersection of two arrays.
array_uintersect() Compute the intersection of two or more arrays depending on the values
array_unique() This function removes duplicate
array_unshift() Elements are added to the beginning of the array. 
array_values() Get an array of values from another array that may contain key-value pairs or just values.
array_walk_recursive()The array element’s keys and values are parameters in the callback function.
array_walk() It is a user-defined function for, every element of the array.
array() This is used to create an array. 
arsort() Sort an array according to values.
compact()Create an array using variables. 
count() Count the current elements in the array. 
current() Return the value of the element in an array, which is the internal pointer.

each()

Returns the current key-value pair of an array and advances the internal pointer.

end()Find the last element of the given array.
extract() The extract() function does array to variable conversion. 
in_array()Check whether a given value exists in an array or not.
key() Return the index of the element of a given array to which is the internal pointer.  
krsort() Sort an array by key in reverse order according to its index values.
ksort() Sort an array in ascending order according to its key values.
list()Assign array values to multiple variables at a time.
natcasesort()Sort an array by using a “natural order” algorithm.
natsort()Sort an array by using a “natural order”, it does not check the type of value for comparison
next()The next() function increments the internal pointer after returning the value
pos()Return the value of the element in an array to which the internal pointer is currently pointing.
prev()Return the immediate previous element from an array
range()Create an array of elements of any kind such as integers or alphabets within a given range
reset()Move any array’s internal pointer to the first element of that array.
rsort()Sort the array in descending order i.e, greatest to smallest.
shuffle()Shuffle or randomize the order of the elements in an array.
sizeof()Count the number of elements present in an array or any other countable object.
sort()Sort an array in ascending order i.e, smaller to greater.
uasort()Sort an array such that array indices maintain their correlation with the array elements 
uksort()Sort an array according to the keys and not values using a user-defined comparison function.
usort()Sort arrays in an easier way. Here, we are going to discuss a new function usort(). 
each()Get the current element key-value pair of the given array to which the internal pointer is currently pointing.

Common PHP Array Functions

PHP offers a wide variety of functions to manipulate arrays. Below are some of the most commonly used functions.

1. Adding/Removing Elements

  • array_push(): Adds one or more elements to the end of an array.
$fruits = ["Apple", "Banana"];
array_push($fruits, "Cherry", "Date");
print_r($fruits);
  • array_pop(): Removes the last element of an array.
array_pop($fruits);  // Removes "Date"
  • array_shift(): Removes the first element of an array.
array_shift($fruits);  // Removes "Apple"
  • array_unshift(): Adds one or more elements to the beginning of an array.
array_unshift($fruits, "Orange");

2. Array Sorting

  • sort(): Sorts an indexed array in ascending order.
$numbers = [3, 1, 2, 5, 4];
sort($numbers);
print_r($numbers);  // Outputs [1, 2, 3, 4, 5]
  • asort(): Sorts an associative array in ascending order, maintaining the key-value pairs.
$person = ["GFG" => 30, "Kriti"=> 25, "Ayushi" => 35];
asort($person);
print_r($person);  // Sorted by value: ["Kriti" => 25, "GFG" => 30, "Ayushi" => 35]
  • ksort(): Sorts an associative array by its keys in ascending order.
$person = ["name" => "GFG", "age" => 30, "city" => "India"];
ksort($person);
print_r($person);  // Sorted by key: ["age" => 30, "city" => "India", "name" => "GFG"]

Benefits of PHP Array Functions

  • Simplifies Array Tasks: Built-in functions make operations like sorting, filtering, and merging arrays easier.
  • Improves Code Readability: Functions reduce complex code, making it cleaner and more maintainable.
  • Boosts Performance: PHP’s array functions are optimized for faster execution compared to custom code.
  • Saves Time: One-line function calls handle complex array manipulations, speeding up development.
  • Flexible and Customizable: Functions allow customization with user-defined callbacks for more control.

Conclusion

PHP provides a variety of powerful functions to work with arrays, making it easier to add, remove, sort, and manipulate data. Whether you're handling simple lists or complex data structures, these array functions help you manage your data efficiently. By using these functions, you can simplify your code and perform tasks faster. In modern PHP development, mastering these array functions is essential for writing clean and effective code.


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'); $('.spinner-loading-overlay').show(); jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.unlocked-status--improve-modal-content').css("display","none"); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { showErrorMessage(e.responseJSON,e.status) }, }); } else { if(loginData && !loginData.isLoggedIn) { $('.improve-modal--overlay').hide(); if ($('.header-main__wrapper').find('.header-main__signup.login-modal-btn').length) { $('.header-main__wrapper').find('.header-main__signup.login-modal-btn').click(); } return; } } }); $('.left-arrow-icon_wrapper').on('click',function(){ if($('.improve-modal--suggestion').is(":visible")) $('.improve-modal--suggestion').hide(); else{ } $('.improve-modal--improvement').show(); }); const showErrorMessage = (result,statusCode) => { if(!result) return; $('.spinner-loading-overlay:eq(0)').remove(); if(statusCode == 403) { $('.improve-modal--improve-content.error-message').html(result.message); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); return; } } function suggestionCall() { var editorValue = suggestEditorInstance.getValue(); var suggest_val = $(".ContentEditable__root").find("[data-lexical-text='true']").map(function() { return $(this).text().trim(); }).get().join(' '); suggest_val = suggest_val.replace(/\s+/g, ' ').trim(); var array_String= suggest_val.split(" ") //array of words var gCaptchaToken = $("#g-recaptcha-response-suggestion-form").val(); var error_msg = false; if(suggest_val != "" && array_String.length >=4){ if(editorValue.length <= 2000){ var payload = { "gfg_post_id" : `${post_id}`, "suggestion" : `${editorValue}`, } if(!loginData || !loginData.isLoggedIn) // User is not logged in payload["g-recaptcha-token"] = gCaptchaToken jQuery.ajax({ type:'post', url: "https://apiwrite.geeksforgeeks.org/suggestions/auth/create/", xhrFields: { withCredentials: true }, crossDomain: true, contentType:'application/json', data: JSON.stringify(payload), success:function(data) { if(!loginData || !loginData.isLoggedIn) { grecaptcha.reset(); } jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('.suggest-bottom-btn').css("display","none"); $('#suggestion-section-textarea').hide() $('.thank-you-message').css('display', 'flex'); $('.suggestion-section').css('display', 'none'); jQuery('#suggestion-modal-alert').hide(); }, error:function(data) { if(!loginData || !loginData.isLoggedIn) { grecaptcha.reset(); } jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-modal-alert').html("Something went wrong."); jQuery('#suggestion-modal-alert').show(); error_msg = true; } }); } else{ jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-modal-alert').html("Minimum 4 Words and Maximum Words limit is 1000."); jQuery('#suggestion-modal-alert').show(); jQuery('.ContentEditable__root').focus(); error_msg = true; } } else{ jQuery('.spinner-loading-overlay:eq(0)').remove(); jQuery('#suggestion-modal-alert').html("Enter atleast four words !"); jQuery('#suggestion-modal-alert').show(); jQuery('.ContentEditable__root').focus(); error_msg = true; } if(error_msg){ setTimeout(() => { jQuery('.ContentEditable__root').focus(); jQuery('#suggestion-modal-alert').hide(); }, 3000); } } document.querySelector('.suggest-bottom-btn').addEventListener('click', function(){ jQuery('body').append('
'); jQuery('.spinner-loading-overlay').show(); if(loginData && loginData.isLoggedIn) { suggestionCall(); return; } // script for grecaptcha loaded in loginmodal.html and call function to set the token setGoogleRecaptcha(); }); $('.improvement-bottom-btn.create-improvement-btn').click(function() { //create improvement button is clicked $('body').append('
'); $('.spinner-loading-overlay').show(); // send this option via create-improvement-post api jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { showErrorMessage(e.responseJSON,e.status); }, }); });
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