03 Php Array String Functions

PHP Day 3 Geshan Manandhar Developer, Young Innovations Pvt. Limited www.geshanmanandhar.com http://www.php.net

PHP Strings A string is series of characters. In PHP, a character is the same as a byte, which is exactly 256 different characters possible. <?php $s=“I am a string”; $s2=‘I am also a string”; print $s.”---”.$s2; ?>

PHP Strings Another Example <?php $beer = 'Heineken'; echo " $beer's taste is great."; // works, "'" is an invalid character for varnames echo " He drank some $beers."; // won't work, 's' is a valid character for varnames echo " He drank some ${beer}s."; // works echo " He drank some {$beer}s."; // works ?>

Important String Functions explode (string $delimiter, string $string) nl2br ( string $string ) strcmp ( string $str1, string $str2 ) strlen ( string $string ) strtolower ( string $str ) substr ( string $string, int $start [, int $length] ) trim ( string $str ) Example code at day03\prog22_string_functions.php

Array In computer science an array is a data structure consisting of a group of elements that are accessed by indexing. In most programming languages each element has the same data type and the array occupies a contiguous area of storage. Most programming languages have a built-in array data type.

Array ?php $fruits_1 = array ("Apple", "Mango", "Banana"); $fruits_2 = array ( 0 => "Appple", 1 => "Mango", 2 => "Banana" ); $fruits_3[] = "Apple"; $fruits_3[] = "Mango"; $fruits_3[] = "Banana"; ?> //Program code: day03\prog23_array_more.php

Multi-Dimensional Array <?php $shop = array( array( Title => "rose", Price => 1.25, Number => 15 ), array( Title => "daisy", Price => 0.75, Number => 25, ), array( Title => "orchid", Price => 1.15, Number => 7 ) ); ?> //full code at day03\prog24_array_multi.php

Important Array Function: asort asort($array) – Sort an array and maintain index association <?php $fruits = array ("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple"); asort($fruits); foreach ($fruits as $key => $val) { echo "$key = $val\n"; } ?>

Important Array Function: push/pop array_push($array, element1,…) <?php $stack = array("orange", "banana"); array_push($stack, "apple", "raspberry"); print_r($stack); ?> array_pop($array) <?php $stack = array("orange", "banana", "apple", "raspberry"); $fruit = array_pop($stack); print_r($stack); ?>

Important Array Function: search array_search($array, “item1”, “item2”…); <?php $array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red'); $key = array_search('green', $array); // $key = 2; $key = array_search('red', $array); // $key = 1; ?>

Important Array Function : rand array_random ($array, no_of_entries); <?php $sentence = "Pick one or more random entries out of an array"; $input = explode(" ",$sentence); $rand_keys = array_rand($input, 2); echo $input[$rand_keys[0]] . "\n"; echo " "; echo $input[$rand_keys[1]] . "\n"; ?>

Important Array Function : reverse array_reverse($array) <?php $input = array("php", 4.0, "green", "red"); $result = array_reverse($input); $result_keyed = array_reverse($input, true); ?>

Important Array Function : merge array_merge($array1, $array2…); <?php $array1 = array("color" => "red", 2, 4); $array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4); $result = array_merge($array1, $array2); print_r($result); ?>

Important Array Function: keys array_keys($array, param) <?php $array = array(0 => 100, "color" => "red"); print_r(array_keys($array)); $array = array("blue", "red", "green", "blue", "blue"); print_r(array_keys($array, "blue")); ?>

Date in php Code Description d Day of the month with leading zeros D Day of the week as a three-letter abbreviation F Name of the month h Hour from 01to 12 H Hour from 00 to 23 g Hour from 1 to 12(no leading zeroes) G Hour from 0 to 23(no leading zeroes) i Minutes j Day of the month with no leading zeroes l Day of the week m Month number from 01 to 12 M Abbreviated month name (Jan, Feb…) n Month number from 1 to 23(no leading zeroes) s Seconds 00 to 59 S Ordinal suffix for day of the month (1st, 2nd, 3rd) y Year as two digits Y Year as four digits z Day of the year from 0 to 365

Some Date examples <?php // Assuming today is: March 10th, 2008, 5:16:18 pm $today = date("F j, Y, g:i a"); // March 10, 2008, 5:16 pm $today = date("m.d.y"); // 03.10.08 $today = date("j, n, Y"); // 10, 3, 2008 $today = date("Ymd"); // 20080310 $today = date('h-i-s, j-m-y, it is w Day z '); $today = date('\i\t \i\s \t\h\e jS \d\a\y.'); // It is the 10th day. $today = date("D M j G:i:s T Y"); $today = date('H:m:s \m \i\s\ \m\o\n\t\h'); $today = date("H:i:s"); // 17:16:17 ?>

Important Debugging Functions print_r Prints human-readable information about a variable var_dump Dumps information about a variable die() or exit() Dumps information about a variable

The more you dig in the more you find out Find out other built in functions in PHP yourself. Search at www.php.net for more.

Questions Put forward your queries.

Lets get rolling Print today’s date like Today is: December 18, 2008 and time is 12:10:10 PM. Reverse this sentence $str= “PHP learn to want I “ into a meaningful sentence, with use of array_reverse. “ Learning PHP is not that easy and not that difficult” – print it in lower and upper case with its string length.

03 Php Array String Functions

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03 Php Array String Functions