Programming PHP

Creates an array containing all values from the original array for which the given callback
function returns true. If the input array is an associative array, the keys are preserved. For
example:
function isBig($inValue) {
return($inValue > 10);
}
$array = array(7, 8, 9, 10, 11, 12, 13, 14);
$new_array = array_filter($array, "isBig"); // contains (11, 12, 13, 14)
array_flip
array array_flip(array array)
Returns an array in which the elements’ keys are the original array’s values, and vice versa.
If multiple values are found, the last one encountered is retained. If any of the values in the
original array are any type except strings and integers, array_flip( ) returns false.
array_intersect
array array_intersect(array array1, array array2[, ... array arrayN])
Returns an array whose elements are those from the first array that also exist in every other
array.
array_keys
array array_keys(array array[, mixed value])
Returns an array containing all of the keys in the given array. If the second parameter is
provided, only keys whose values match value are returned in the array.
array_map
array array_map(mixed callback, array array1[, ... array arrayN])
Creates an array by applying the callback function referenced in the first parameter to the
remaining parameters; the callback function should take as parameters a number of values
equal to the number of arrays passed into array_map( ). For example:
function multiply($inOne, $inTwo) {
return $inOne * $inTwo;
}
$first = (1, 2, 3, 4);
$second = (10, 9, 8, 7);
$array = array_map("multiply", $first, $second); // contains (10, 18, 24, 28)
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