PHP supports arrays that are indexed both by integers and by arbitrary strings—known as associative arrays. Internally, PHP does not distinguish between associative arrays and integer-indexed arrays, as arrays are implemented as hash tables. Here are the array functions supported by PHP:
array array(...)Create an array that contains all of the specified arguments
int array_walk(array array_arg, string function)Apply a function to every member of an array
int arsort(array array_arg)Sort an array in reverse order and maintain index association
int asort(array array_arg)Sort an array and maintain index association
int count(mixed var)Count the number of elements in a variable (usually an array)
mixed current(array array_arg)Return the element currently pointed to by the internal array pointer
array each(array array_arg)Return the next key/value pair from an array
mixed end(array array_arg)Advance the array’s internal pointer to the last element and return the value of that element
void extract(array var_array, int extract_type[, string prefix])Import variables into a symbol table from an array
mixed key(array array_arg)Return the key of the element currently pointed to by the internal array pointer
int krsort(array array_arg)Sort an array in reverse by key
int ksort(array array_arg)Sort an array by key
mixed max(mixed arg1 [, mixed arg2 [, ...]])Return the highest value in an array or a series of arguments
mixed min(mixed arg1 [, mixed arg2 [, ...]])Return the lowest value in an array or a series of arguments
mixed next(array array_arg)Move the array’s internal pointer to the next element and return the value of that element
mixed pos(array array_arg)An alias for
current( )mixed prev(array array_arg)Move the array’s internal pointer to the previous element and return the value of that element
array range(int low, int high)Create an array containing the range of integers from low to high (inclusive)
mixed reset(array array_arg)Set the array’s internal pointer to the first element and return the value of that element
int rsort(array array_arg)Sort an array in reverse order
int shuffle(array array_arg)Randomly shuffle the contents of an array
int sizeof(mixed var)An alias for
count( )int sort(array array_arg)Sort an array
int uasort(array array_arg, string cmp_function)Sort an array with a user-defined comparison function and maintain index association
int uksort(array array_arg, string cmp_function)Sort an array by keys using a user-defined comparison function
int usort(array array_arg, string cmp_function)Sort an array using a user-defined comparison function