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Meaing of Associative Array in PHP?
There are two types of arrays, associative arrays, and indexed arrays. Indexed arrays are where you access the items in order, for example $myArray[0] would be the first item in the array, $myArray[1] would be the second item, and so on. You can create an indexed array like this: $myArray = array("item1","item2","item3"); echo $myArray[0]; //item1 echo $myArray[2]; //item3 You can also set your own indexes: $myArray = array(0=>"item1", 1=>"item2", 5=>"number 5"); echo $myArray[0]; //item1 echo $myArray[2]; //null or doesnt exist, i cant remember You can also add items after using the square-brackets. If you include a number, that index is set, otherwise it just adds it to the end of the array. $myArray[9] = "set index 9"; $myArray[] = "add to the end of the array"; Associative arrays use strings instead of numbers. $colors = array("cat"=>"brown", "dog"=>"yellow", "fish"=>"purple"); echo $colors["cat"]; //brown echo $colors["fish"]; //purple And you can add more with the square-brackets again. $colors["camel"] = "green"; To loop through both types of arrays you can use a foreach loop, or to loop through indexed arrays you can get the length into a variable and a do normal for loop.
What is the difference between array and control array?
An array is a set of values that are logically related to each other, such as the number of students in each grade in a grammar school. An array allows you to refer to these related values by the same name and to use a number, called an index or subscript, to tell them apart. The individual values are called the elements of the array. They are contiguous from index 0 through the highest index value. A control array is a group of controls that share the same name type and the same event procedures. Adding controls with control arrays uses fewer resources than adding multiple control of same type at design time.
You have only one rectangular array and you are between the numbers 12 and 16 what number are you?
13...13x1.
How do you empty an array in PHP?
To empty an array in PHP you need to use the unset function like shown below: <?php $array = array('hello', 'hi', 'weee'); unset($array); // empty ?>
What is square array?
It is an array with the same number of rows and columns.
