Favorite common php array operation functions

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Tags arrays int size lowercase php tutorial shuffle sorts

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])

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