Favorite common php array operation functions

PHP Array functions

PHP: indicates the earliest PHP version that supports this function.

Function	Description	PHP
Array ()	Create an array.	3
Array_change_key_case ()	Returns an array with uppercase or lowercase keys.	4
Array_chunk ()	Splits an array into new array blocks.	4
Array_combine ()	Create a new array by combining two arrays.	5
Array_count_values ()	Used to count the number of times all values appear in the array.	4
Array_diff ()	Returns the number of difference sets of two arrays.	4
Array_diff_assoc ()	Compare the key name and key value, and return the number groups of the two arrays.	4
Array_diff_key ()	Compare the key name, and return the number groups of the two arrays.	5
Array_diff_uassoc ()	You can use the callback function provided by the user to perform an index check to calculate the array's difference set.	5
Array_diff_ukey ()	Use the callback function to compare the difference set of the calculated array with the key name.	5
Array_fill ()	Fill the array with the given value.	4
Array_filter ()	Use the callback function to filter elements in the array.	4
Array_flip ()	Exchange keys and values in the array.	4
Array_intersect ()	Calculates the intersection of arrays.	4
Array_intersect_assoc ()	Compare the key name and key value, and return the intersection array of the two arrays.	4
Array_intersect_key ()	Use the key name to compare and calculate the intersection of arrays.	5
Array_intersect_uassoc ()	Check and calculate the intersection of arrays with indexes, and use the callback function to compare indexes.	5
Array_intersect_ukey ()	Use the callback function to compare the key names to calculate the intersection of arrays.	5
Array_key_exists ()	Check whether the given key name or index exists in the array.	4
Array_keys ()	Returns all the key names in the array.	4
Array_map ()	The callback function acts on the units of the given array.	4
Array_merge ()	Combine one or more numbers into an array.	4
Array_merge_recursive ()	Recursively merges one or more arrays.	4
Array_multisort ()	Sorts multiple arrays or multi-dimensional arrays.	4
Array_pad ()	Fill the array with values to the specified length.	4
Array_pop ()	Bring up the last unit of the array (out stack ).	4
Array_product ()	Calculates the product of all values in the array.	5
Array_push ()	Push one or more units (elements) to the end of the array (into the stack ).	4
Array_rand ()	Randomly selects one or more elements from the array and returns the result.	4
Array_reduce ()	Use the callback function to iteratively simplify the array to a single value.	4
Array_reverse ()	Flip the elements in the original array sequentially, create a new array, and return it.	4
Array_search ()	Search for the given value in the array. If the value is successful, the corresponding key name is returned.	4
Array_shift ()	Delete the first element in the array and return the value of the deleted element.	4
Array_slice ()	Extract a value from the array based on the conditions and return it.	4
Array_splice ()	Remove part of the array and replace it with other values.	4
Array_sum ()	Calculates the sum of all values in the array.	4
Array_udiff ()	Use the callback function to compare data to calculate the difference set of the array.	5
Array_udiff_assoc ()	Calculate the difference set of the array with index check, and use the callback function to compare the data.	5
Array_udiff_uassoc ()	Use the callback function to compare data and indexes.	5
Array_uintersect ()	Calculate the intersection of arrays and use the callback function to compare the data.	5
Array_uintersect_assoc ()	Check and calculate the intersection of arrays with indexes, and use the callback function to compare data.	5
Array_uintersect_uassoc ()	Use the callback function to compare data and indexes.	5
Array_unique ()	Delete repeated values in the array.	4
Array_unshift ()	Insert one or more elements at the beginning of the array.	4
Array_values ()	Returns all values in the array.	4
Array_walk ()	Apply user functions to each member in the array.	3
Array_pai_recursive ()	Recursively apply user functions to each member in the array.	5
Arsort ()	Sort the array in reverse order and maintain the index relationship.	3
Asort ()	Sorts the array and maintains the index relationship.	3
Compact ()	Create an array, including the variable names and their values.	4
Count ()	Calculates the number of elements in an array or the number of attributes in an object.	3
Current ()	Returns the current element in the array.	3
Each ()	Returns the current key/value pair in the array and moves the array pointer one step forward.	3
End ()	Point the internal pointer of the array to the last element.	3
Extract ()	Import the variable from the array to the current symbol table.	3
In_array ()	Check whether the specified value exists in the array.	4
Key ()	Obtain the key name from the joined array.	3
Krsort ()	Sort the array in reverse order by key name.	3
Ksort ()	Sort the array by key name.	3
List ()	Assign values in the array to some variables.	3
Natcasesort ()	Use the "natural sorting" algorithm to sort arrays by case-insensitive letters.	4
Natsort ()	Sort arrays using the "natural sorting" algorithm.	4
Next ()	Move the internal pointer in the array one by one.	3
Pos ()	The alias of current.	3
Prev ()	Returns the internal pointer of the array to one position.	3
Range ()	Creates an array containing elements in a specified range.	3
Reset ()	Points the internal pointer of the array to the first element.	3
Rsort ()	Sorts arrays in reverse order.	3
Shuffle ()	Sorts the elements in the array in random order.	3
Sizeof ()	The alias of count.	3
Sort ()	Sorts arrays.	3
Uasort ()	Use the custom comparison function to sort the values in the array and maintain the index Association.	3
Uksort ()	Sort the key names in the array using the custom comparison function.	3
Usort ()	Sort the values in the array using the user-defined comparison function.	3

PHP Array constant

PHP: indicates the earliest PHP version that supports this constant.

Constant	Description	PHP
CASE_LOWER	Use array_change_key_case () to convert the array key name to lowercase letters.
CASE_UPPER	Convert the array key name into uppercase letters in array_change_key_case.
SORT_ASC	It is used in the array_multisort () function to sort it in ascending order.
SORT_DESC	It is used in the array_multisort () function to sort it in descending order.
SORT_REGULAR	Used to compare objects.
SORT_NUMERIC	Used to compare the value of an object.
SORT_STRING	It is used to compare strings of objects.
SORT_LOCALE_STRING	Compares strings of objects based on the current region.	4
COUNT_NORMAL
COUNT_RECURSIVE
EXTR_OVERWRITE
EXTR_SKIP
EXTR_PREFIX_SAME
EXTR_PREFIX_ALL
EXTR_PREFIX_INVALID
EXTR_PREFIX_IF_EXISTS
EXTR_IF_EXISTS
EXTR_REFS

 

Favorite common php Tutorial array operation functions

Search for a specific value in the array. If yes, return TRUE. Otherwise, return FALSE.
Boolean in_array (mixed needle, array haystack [, boolean strict])

Find a specified key in the array. If yes, return TRUE. Otherwise, return FALSE.
Boolean array_eky_exists (mixed key, array)

Search for a specific value in the array. If yes, return TRUE. Otherwise, return FALSE.
Boolean array_search (mixed needle, array haystack [, boolean strict])

Obtains a new array composed of all the keys in the array.
Array array_keys (array [, mixed search_value])

Obtains a new array composed of all values of the array.
Array array_values (array)

Determine the array size
Integer count (array [, int mode])

Integer sizeof (array [, int mode])

Count the occurrence frequency of array elements
Array array_count_values (array)

Deletes repeated values in an array and returns an array consisting of unique values.
Array array_unique (array)

Returns the element order of the array. If the value of preserve_key is TRUE, the order of the key values of the array remains unchanged.
Array array_reverse (array [, boolean preserve_key])

Replace the array key and value
Array array_flip (array)

Sort arrays sequentially. The sort_flags parameter is optional. Default behavior.
SORT_NUMBERIC, sorted by numerical value, useful for sorting integers or floating-point numbers

SORT_REGULAR, sorted by ASCII value

SORT_STRING, which is sorted by the correct order of the nearest person

The key-value sequence of the asort function remains unchanged.

Void sort (array [, int sort_flags])

Void asort (array [, int sort_flags])

Array sorting in reverse order. The sort_flags parameter is optional. Default behavior.
SORT_NUMBERIC, sorted by numerical value, useful for sorting integers or floating-point numbers

SORT_REGULAR, sorted by ASCII value

SORT_STRING, which is sorted by the correct order of the nearest person

The order of the key values of the arsort function remains unchanged.

Void rsort (array [, int sort_flags])

Void arsort (array [, int sort_flags])

Natural sorting of arrays
Void natsort (array)

Case-insensitive natural sorting
Void natcasesort (array)

Sort the key-value pairs in an array
Boolean ksort (array [, int sort_flags])

Sort the key-value pairs in reverse order.
Boolean krsort (array [, int sort_flags])

Sort by user-defined order
Void usort (array, callback function_name)

Merges the arrays to return a Union array. Array_merge overwrites the front, and array_merge_recursive is merged.
Array array_merge (array array1 [array array2…]) // More than one

Array array_merge_recursive (array array1, array array2 [, array…]) // More than two

Key and value form a new array
Array array_combine (array key, array value)

Returns a part of the array, starting from the offset and ending at the offse + length position.
Array array_slice (array, int offset [, int length])

Delete all elements starting from offset to ending with offset + length, and return the deleted elements as arrays.
Array array_splice (array, int offset [, int length [, array peplacement])

Returns the intersection of arrays. The key value is the key value in the first array.
Array array_intersect (array array1, array array2 [, arrayN…])

The intersection of the array contains the same key value. The key value is the key value of the first array.
Array array_intersect_assoc (array array1, array array2 [, arrayN…])

Evaluate the difference set of the array. The first array does not have values in other arrays.
Array array_diff (array array1, array array2 [, arrayN…])

Evaluate the difference set of the array. The first array does not have the same key value in other arrays.
Array array_diffassoc (array array1, array array2 [, arrayN…])

Returns one or more key values in the array.
Mixed array_rand (array [, int num_entries])

Shuffling function
Void shuffle (array input_array)

Summation of values in the array
Mixed array_sum (array );

Splits an array into a multi-dimensional array that contains size elements.
Array array_chunk (array, int size [, boolean preserve_keys])