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PHP Reference: Beginner to Intermediate PHP5

PHP Reference: Beginner to

Intermediate PHP5

1

Mario Lurig

PHP Reference:ɎɎɎɎŵųųŻ

Beginner to Intermediate PHP5

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PHP Reference: Beginner to Intermediate PHP5

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,¿20+Ɏ%»´©º¯µ´¹ Ȍ Ȍ Ȍ Ȍ Ȍ Ȍ ŴŴŸ

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3

Mario Lurig

4

PHP Reference: Beginner to Intermediate PHP5

5

Mario Lurig

// Standard syntax if ($x == 1) { echo "Hello World!"; } else { echo "Goodbye World!"; // Alternative syntax if ($x == 1): echo "Hello World!"; else: echo "Goodbye World!"; endif;

1 Boolean is usually used within an expression. While it is also evaluated as a variable, output

results may vary and are noted within specific functions whenever possible 6

PHP Reference: Beginner to Intermediate PHP5

Code with // comments

Output of code as seen through a web browser"s output

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7

Extra code

related to the tip

Output

[0] => Of [1] => Code

Mario Lurig

8

PHP Reference: Beginner to Intermediate PHP5

0»µº§º¯µ´¹

$string = "Single Quotes"; echo "$string"; $string 9

Mario Lurig

$string = "Double Quotes"; echo "$string";

Double Quotes

$string = "Double Quotes"; echo "\$string is set as $string"; $string is set as Double Quotes $string = "Hello World!"; echo "The variable \$string contains \" $string \" \" \\"; The variable $string contains \" Hello World! \" " \ echo "The variable \$string contains \" $string \" \" \\";

The variable \$string contains " $string " \" \

// This is a comment /* This is a comment */ 10

PHP Reference: Beginner to Intermediate PHP5

\nɎɋɎ-"½Ɏ²¯´" \tɎɋɎ3§¨ define("HELLO", "Hello World!"); echo HELLO;

Hello World!

define("GREETINGS", "Hello World!", TRUE); echo GREETINGS; echo greetings;

Hello World!Hello World!

function functionname([arguments]) { } hello(); // Above the conditional statement, this will cause an error if (0==0){ function hello(){ echo "Hello!";

Fatal error: Call to undefined function hello()

11

Mario Lurig

if (0==0){ function hello(){ echo "Hello "; hello(); there(); function there(){ echo "there";

Hello there

function args($a, $b){ // Has no default values, requires two inputs echo "a = $a, b = $b"; args(1,2); a = 1, b = 2 function args($a = 1, $b = 2){ // Has default values set $c = $a + $b; echo "a = $a, b = $b, a+b = $c"; args(); a = 1, b = 2, a+b = 3 args(5,5); a = 5, b = 5, a+b = 10 args(10); a = 10, b = 2, a+b = 12 args($DoesNotExist,20); // Do not do this, send (NULL,20) instead a = , b = 20, a+b = 20 function Add($one,$two){ $total = $one + $two; return $total; $a = 2; $b = 3; $result = Add($a,$b); // Assigns the value of $total to $result echo $result; 5 12

PHP Reference: Beginner to Intermediate PHP5

$result = @mysql_connect("db", "user", "pw") or die("Unable to connect to database!"); echo "If it fails, this will never be seen";

Unable to connect to database!

$name = "Mario"; $string = "My name is $name."; // Note the single quotes echo $string; $code = "\$evalstring = \" $string \" ;"; // Effect of backslash escape: $code = "$evalstring = " $string " ;"; eval($code); // eval($evalstring = " My name is $name " ;); // $evalstring is the same as $string, except with double quotes now echo $evalstring;

My name is $name. My name is Mario.

sleep(2); // pause for 2 seconds 13

Mario Lurig

usleep(1000000); // pause for 1 second $id = uniqid(); echo $id;

47cc82c917c99

$random_id = uniqid(mt_rand()); echo $random_id;

63957259147cc82c917cdb

$md5 = md5($random_id); echo $md5; ea573adcdf20215bb391b82c2df3851f

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14

PHP Reference: Beginner to Intermediate PHP5

setcookie("Cookie","Set till end of this session",0); // This will display properly after the page has been reloaded print_r($_COOKIE); Array ( [Cookie] => Set till end of this session ) setcookie("Cookie","Set for 60 seconds for all subdomains of example.com, such as www., mail., etc.",time()+60,"",".example.com"); print_r($_COOKIE); Array ( [Cookie] => Set for 60 seconds for all subdomains of example.com, such as www., mail., etc. ) setcookie("Cookie","",time()-1); // expires the Cookie named "Cookie". Note the empty string for value $string = "Hello There! How are you?"; echo urlencode($string);

Hello+There%21+How+are+you%3F

$string = "Hello+There%21+How+are+you%3F"; echo urldecode($string);

Hello There! How are you?

2 Must be sent prior to any headers or anything else is sent to the page (including the

tag). See ob_start() for an easy way to make this work 15

Mario Lurig

if (get_magic_quotes_gpc()){ echo "Magic Quotes is on!"; }else{ echo "Magic Quotes is NOT on, use addslashes()!"; // This is the default setting for PHP5 installations

Magic Quotes is NOT on, use addslashes()!

2""Ɏ ²¹µȎ

phpinfo(); error_reporting(E_ALL); ini_set("display_errors", "1"); 16

PHP Reference: Beginner to Intermediate PHP5

$to = "johndoe@example.com"; $subject = "Hello"; $message = "Hi John Doe"; $headers = "From: janedoe@example.com" . "\r\n" . "Reply-To: janedoe@example.com" . "\r\n" . "X-Mailer: PHP/" . phpversion(); mail($to, $subject, $message, $headers); $lastline = exec("cal", $output, $return); echo "

"; // For better formatting of print_r() print_r($output); var_dump($lastline, $return); Array [0] =>      March 2008 [1] => Su Mo Tu We Th Fr Sa [2] =>                    1 [3] =>  2  3  4  5  6  7  8 17 
Mario Lurig
 [4] =>  9 10 11 12 13 14 15 [5] => 16 17 18 19 20 21 22 [6] => 23 24 25 26 27 28 29 [7] => 30 31 string(5) "30 31" int(0) header("Location: http://www.someotherplace.com"); // Redirects the user to the provided URL header("HTTP/1.0 404 Not Found"); // Sends the HTTP status code 404 
2""Ɏ ²¹µȎ
 class class_name [extends base_class]{ var variable_name; // Defines a variable function function_name([arguments]) { // Stuff to do goes here $variable = new class_name(); 18 
PHP Reference: Beginner to Intermediate PHP5
 ªªɎȘɎǕɎșȎɎ$a = 1; $a = $a + 5; // $a is equal to 6 
2»¨º¸§©ºɎȘɎɉɎșȎɎ$s = 10; $s = $s - 5; // $s is equal to 5
 #¯¼¯ª"ɎȘɎɃɎșȎɎ$d = 20; $d = $d / 5; // $d is equal to 4 $u = 5; $u = $u % 2; // $u is equal to 1 $u = 5; $u %= 2; // $u is equal to 1 $c = 5; $c .= 2; // $c is now a string, "52" 
2""Ɏ ²¹µȎ
 19 
Mario Lurig
 &¸"§º"¸Ɏ3®§´ɎȘɎǞɎșȎɎ2 > 1 +"¹¹Ɏ3®§´ɎȘɎǝɎșȎɎ1 < 2 $a = 1; $a = $a + 1; // $a is now equal to 2 $a++; // $a is now equal to 3 $a--; // $a is now equal to 2 again, same as $a = $a - 1; include("DoesNotExist.txt"); Warning: include(DoesNotExist.txt) [function.include]: failed to open stream: No such file or directory @include("DoesNotExist.txt"); // blank output below because the error was suppressed $a = 1; $b = &$a; // $b references the same value as $a, currently 1 $b = $b + 1; // 1 is added to $b, which effects $a the same way echo "b is equal to $b, and a is equal to $a"; b is equal to 2, and a is equal to 2 20 
PHP Reference: Beginner to Intermediate PHP5
 (expr) ? ValueIfTrue : ValueIfFalse ; $boolean = TRUE; $result = ($boolean) ? "Is True" : "Is False"; echo $result; 
Is True
 // $result is not yet set $result = (isset($result)) ? $result+1 : 10; echo " \$result = $result."; $result = (isset($result)) ? $result+1 : 10; echo " \$result = $result."; $result = 10. $result = 11. 21
 function add(&$var){ // The & is before the argument $var $var++; $a = 1; $b = 10; add($a); echo "a is $a,"; add($b); echo " a is $a, and b is $b"; // Note: $a and $b are NOT referenced a is 2, a is 2, and b is 11 $array = array(1,2,3,4); foreach ($array as &$value){ $value = $value + 10; unset ($value); // Must be included, $value remains after foreach loop print_r($array); 
Array ( [0] => 11 [1] => 12 [2] => 13 [3] => 14 )
 
Mario Lurig
 
3®"Ɏ$·»§²Ɏ2¯´
 $a = 1; // Sets the value of $a as 1 by assignment $b = TRUE; // Sets the value of $b to the boolean TRUE if ($a == $b){ echo "a is equal to b."; if ($a === $b){ echo "a is identical and equal to b."; a is equal to b. 
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 $a = 1; if (!isset($a)){ // If the variable $a is NOT set then...quotesdbs_dbs6.pdfusesText_11