PHP Developer''''s Dictionary- P24 doc

PHP Developer’s Dictionary IT-SC book 115 $array1 = array(1,2,"two"=>3); $array2 = array("one"=>1,"two"=>2); $array3 = array_merge ($array1,$array2); //$array3 =(1,2,"two"=>2,"one"=>1) array_merge_recursive() Syntax array array_merge_recursive(array array1, array array2, [ ]) Description The array_merge_recursive() function , which was added in PHP 4.0, appends multiple arrays together to form one single array. If one of the array parameters contains further arrays, it is also merged. $array1 = array ("type" => array ("values" => "long"), 1); $array2 = array (2, "type" => array ("values" => "int","blob"); $array3 = array_merge_recursive ($array1, $array2); //$array3 = ("type" => array("values"=>array("int","blob"),"long"),1,2) array_multisort() Syntax array array_multisort(array ar1 [, mixed arg [, mixed [, array ]]]) Description The array_multisort() function, which was added in PHP 4.0b4, is used to sort multiple arrays as well as multidimensional arrays. The first parameter must be an array, but subsequent parameters can be either an array or a sorting flag. Sort order flags are either SORT_ASC or SORT_DESC , indicating a sort in ascending or descending order, respectively. Possible sort order flag types include SORT_REGULAR , SORT_STRING , and SORT_NUMERIC . The defaults are SORT_ASC and SORT_REGULAR , and the flags apply to only the previously specified array—not every array in the parameter list. array_pad() PHP Developer’s Dictionary IT-SC book 116 Syntax array array_pad(array input, int pad_size, mixed pad_value) Description The array_pad() function , which was added in PHP 4.0b4, expands the input array with pad_value to reach the pad_size . If the pad_size is positive, padding occurs on the right, and padding occurs on the left if the pad_size is negative. If the input array size is greater than the pad_size , no padding takes place. array_pop() Syntax mixed array_pop(array array) Description The array_pop() function, which was added in PHP 4.0, removes and returns the last element from array . This allows an array to act as a stack data structure with the stack top at the end of the array. $array1 = array (1,2,3); $top = array_pop($array1);//$top = 3, $array1=(1,2) array_push() Syntax int array_push(array array, mixed var, [ ]) Description The array_push() function, which was added in PHP 4.0, appends the passed-in variables to the end of the array . This allows the array to act as a stack or queue data structure. Items can be either pushed onto the stack or enqueued at the end of the queue. $array1 = array (1,2); PHP Developer’s Dictionary IT-SC book 117 array_push ($array1,3);//$array1 = (1,2,3) array_rand() Syntax int array_rand(array input [, int num_req ]) Description The array_rand() function, which was added in PHP 4.0, randomly picks a key or keys from the input array. If num_req is 1 or not specified, one key will be returned; if num_req is greater than 1 , an array with the keys will be returned. The srand() function should be called to generate a new random seed before using this function. array_reverse() Syntax array array_reverse(array array) Description The array_reverse() function, which was added in PHP 4.0b4, returns an array that is the passed-in array with its element order reversed. array_shift() Syntax mixed array_shift(array array) Description The array_shift() function, which was added in PHP 4.0, removes the first element of the array and returns it. This could be used to implement a queue data structure in order to dequeue items from the queue. $array1 = array (1,2,3); $front = array_shift($array1);//$front = 1, $array1=(2,3) PHP Developer’s Dictionary IT-SC book 118 array_slice() Syntax array array_slice(array array, int offset, int [length] ) Description The array_slice() function, which was added in PHP 4.0, returns a subset of the parameter array beginning at the offset and extending for the length . If offset is positive, the subset is based on the start of the array. If offset is negative, the subset is based on the end of the array. The length parameter is optional, and when positive, results in the subset containing the length number of elements. When length is negative, it indicates the subset should stop length away from the end of the array. If length is omitted, the subset will contain everything from the offset until an array boundary has been reached. $array1 = array (1,2,3,4,5); $slice = array_slice($array1,1,3);//$slice = (2,3,4) array_splice() Syntax array array_splice(array inpt, int offset, int [length] , array [replacement]) Description The array_splice() function, which was added in PHP 4.0, removes a subset of input bounded by the offset and length parameters. Optionally, the elements can be replaced with replacement . If offset is positive, the offset is measured from the beginning of input . If offset is negative, it is measured from the end of input . If the optional length parameter is omitted, removal occurs from offset to a boundary of input . If length is positive, the corresponding number of elements will be removed. If length is negative, the last element of the removed portion of the input array will be length number of elements from the end of the array. To remove everything from the offset to the end of the array, specify count($input) as the length parameter. PHP Developer’s Dictionary IT-SC book 119 The optional replacement array will be put in place of any deleted elements. If offset and length don't account for the removal of any elements, replacement is inserted at the offset location. When replacement is just one element and not an array itself, it is not necessary to place an array() around it. $array1 = array (1,2,3,4,5); $array2 = array (4,3,2); $array3 = array_splice($array1,1,3,$array2);//$array3 = (2,3,4),$array1 = (1,4,3,2,5) array_unique() Syntax int array_unique(array array) Description The array_unique() function, which was added in PHP 4.0.1, returns an array that is the array parameter with any duplicates removed. array_unshift() Syntax int array_unshift(array array, mixed var,[, mixed ]) Description The array_unshift() function, which was added in PHP 4.0, adds to the array any of the parameters passed in to the front of the array. The return value is the number of elements prepended to array . array_values() Syntax array array_values(array input) Description . array_pad() PHP Developer’s Dictionary IT-SC book 116 Syntax array array_pad(array input, int pad_size, mixed pad_value) Description The array_pad() function , which was added in PHP 4.0b4,. array array2, [ ]) Description The array_merge_recursive() function , which was added in PHP 4.0, appends multiple arrays together to form one single array. If one of the array parameters. [, mixed [, array ]]]) Description The array_multisort() function, which was added in PHP 4.0b4, is used to sort multiple arrays as well as multidimensional arrays. The first parameter