diff options
| -rw-r--r-- | php.html.markdown | 63 |
1 files changed, 53 insertions, 10 deletions
diff --git a/php.html.markdown b/php.html.markdown index 7db50136..20923548 100644 --- a/php.html.markdown +++ b/php.html.markdown @@ -10,7 +10,8 @@ This document describes PHP 5+. ```php <?php // PHP code must be enclosed with <?php ? > tags -// If your php file only contains PHP code, it is best practise to omit the php closing tag. +// If your php file only contains PHP code, it is best practise +// to omit the php closing tag. // Two forward slashes start a one-line comment. @@ -171,8 +172,8 @@ $d = '1'; // These comparisons will always be true, even if the types aren't the same. assert($a == $b); // equality -assert($b != $a); // inequality -assert($a <> $b); // alternative inequality +assert($c != $a); // inequality +assert($c <> $a); // alternative inequality assert($a < $c); assert($c > $b); assert($a <= $b); @@ -254,7 +255,8 @@ This is displayed otherwise. switch ($x) { case '0': print 'Switch does type coercion'; - break; // You must include a break, or you will fall through to cases 'two' and 'three' + break; // You must include a break, or you will fall through + // to cases 'two' and 'three' case 'two': case 'three': // Do something if $variable is either 'two' or 'three' @@ -367,7 +369,45 @@ $bar('C'); // Prints "A - B - C" $function_name = 'add'; echo $function_name(1, 2); // => 3 // Useful for programatically determining which function to run. -// Alternatively, use call_user_func(callable $callback [, mixed $parameter [, mixed $... ]]); +// Or, use call_user_func(callable $callback [, $parameter [, ... ]]); + +/******************************** + * Includes + */ + +/* +``` +```php +<?php +// Included files must also begin with a PHP open tags. + +include 'my-file.php'; +// The code in my-file.php is now available in the current scope. +// If the file cannot be included (e.g. file not found), a warning is emitted. + +include_once 'my-file.php'; +// If the code in my-file.php has been included elsewhere, it will +// not be included again. This prevents multiple class declaration errors + +require 'my-file.php'; +require_once 'my-file.php'; +// Same as include(), except require() will cause a fatal error if the +// file cannot be included. + +// Contents of my-include.php: +<?php + +return 'Anything you like.'; +// End file + +// Includes and requires may also return a value. +$value = include 'my-include.php'; + +// Files are included based on the file path given or, if none is given, +// the include_path configuration directive. If the file isn't found in +// the include_path, include will finally check in the calling script's +// own directory and the current working directory before failing. +/* */ /******************************** * Classes @@ -384,8 +424,8 @@ class MyClass // Properties must declare their visibility public $property = 'public'; public $instanceProp; - protected $protProp = 'protected'; // Accessible within the class and subclasses - private $privProp = 'private'; // Accessible within the class only + protected $prot = 'protected'; // Accessible from the class and subclasses + private $priv = 'private'; // Accessible within the class only // Create a constructor with __construct public function __construct($instanceProp) { @@ -413,8 +453,11 @@ echo MyClass::MY_CONST; // Outputs 'value'; echo MyClass::$staticVar; // Outputs 'static'; MyClass::myStaticMethod(); // Outputs 'I am static'; +// Instantiate classes using new +$my_class = new MyClass('An instance property'); +// The parentheses are optional if not passing in an argument. + // Access class members using -> -$my_class = new MyClass('An instance property'); // The parentheses are optional if not passing in an argument. echo $my_class->property; // => "public" echo $my_class->instanceProp; // => "An instance property" $my_class->myMethod(); // => "MyClass" @@ -425,7 +468,7 @@ class MyOtherClass extends MyClass { function printProtectedProperty() { - echo $this->protProp; + echo $this->prot; } // Override a method @@ -516,7 +559,7 @@ class SomeOtherClass implements InterfaceOne, InterfaceTwo * Traits */ -// Traits are available since PHP 5.4.0 and are declared using the trait keyword. +// Traits are available from PHP 5.4.0 and are declared using "trait" trait MyTrait { |