1 / 13

PHP 3

PHP 3. Constants, Arrays, Loops. Constants. Cannot be changed Are used without $ define ($name, $value [, $case_sen]) <?php define ("text", “ Hello from PHP !"); define ("num", 10); $result = num*5; echo text; echo "< br / >$result"; ?>. Arrays.

kasi
Download Presentation

PHP 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PHP 3 Constants, Arrays, Loops

  2. Constants • Cannot be changed • Are used without $ define ($name, $value [, $case_sen]) <?phpdefine ("text", “Hello fromPHP!");define ("num", 10);$result = num*5;echo text; echo "<br />$result"; ?>

  3. Arrays An array in PHP is actually an ordered map. A map is a type that maps values to keys. This type is optimized in several ways, so you can use it as a real array, or a list (vector), hashtable (which is an implementation of a map), dictionary, collection, stack, queue and probably more. Because you can have another PHP-array as a value, you can also quite easily simulate trees.

  4. Arrays • An array can be created by the array() language-construct. It takes a certain number of comma-separated key => value pairs. • A key is either an integer or a string. • If you omit a key, the maximum of the integer-indices is taken, and the new key will be that maximum + 1. array( [key =>]value , ... ) array("foo" => "bar", 12 => true);

  5. Arrays • $color = array ('red', 'black', 'white', 'blue', 'green'); • $style = array ( 'color' => 'Red', 'size' => '10px‘); • // This array is the same as ... array(5 => 43, 32, 56, "b" => 12); // ...this array array(5 => 43, 6 => 32, 7 => 56, "b" => 12);

  6. Arrays: multidimensional $book = array (/* $book[0] */array ('name' => 'Vasia', 'family' => 'Petrov', 'phone' => '11-11-11'),/* $book[1] */array ('name' => 'Petia', 'family' => 'Sidorov', 'phone' => '22-22-22'),/* $book[2] */array ('name' => 'Andrey', 'family' => 'Ivanov', 'phone' => '33-33-33'));

  7. Arrays: Creating/modifying $arr[key] = value;- set value (add/change) $arr[] = value; - add new value to the end • If $arr doesn't exist yet, it will be created unset($arr[5]);- remove element unset($arr);- delete array count($array). count($array)-1.

  8. Loops • while - loops through a block of code as long as a specified condition is true • do...while - loops through a block of code once, and then repeats the loop as long as a special condition is true • for - loops through a block of code a specified number of times • foreach -

  9. The while Statement while (condition) code to be executed; <?php $i=1; while($i<=5) { echo "The number is " . $i . "<br />"; $i++; } ?>

  10. The do...while Statement do { code to be executed; } while (condition);

  11. The for Statement for (initialization; condition; increment) { code to be executed; } <?php for ($i=1; $i<=5; $i++) { echo "Hello World!<br />"; } ?>

  12. The foreach Statement <?php $string = 'We have a string'; $array = explode(" ",$string); foreach($array as $value) echo $value.'<br />'; ?>

  13. Loops • break ends execution of the current for, foreach while, do..while or switch structure. • continue is used within looping structures to skip the rest of the current loop iteration and continue execution at the beginning of the next iteration.

More Related