diff options
Diffstat (limited to 'php.html.markdown')
| -rw-r--r-- | php.html.markdown | 40 |
1 files changed, 24 insertions, 16 deletions
diff --git a/php.html.markdown b/php.html.markdown index 82d27546..57ba29c4 100644 --- a/php.html.markdown +++ b/php.html.markdown @@ -34,6 +34,7 @@ echo "World\n"; // Prints "World" with a line break ?> Hello World Again! <?php +// That is because historically PHP started as a Template engine /************************************ @@ -41,12 +42,15 @@ Hello World Again! */ // Variables begin with the $ symbol. -// A valid variable name starts with a letter or underscore, +// A valid variable name starts with a letter or an underscore, // followed by any number of letters, numbers, or underscores. +// You don't have to (and cannot) declare variables. +// Once you assign a value, PHP will create the variable with the right type. + // Boolean values are case-insensitive $boolean = true; // or TRUE or True -$boolean = false; // or FALSE or False +$boolean = FALSE; // or false or False // Integers $int1 = 12; // => 12 @@ -122,9 +126,9 @@ echo 'Multiple', 'Parameters', 'Valid'; // Returns 'MultipleParametersValid' // followed by any number of letters, numbers, or underscores. define("FOO", "something"); -// access to a constant is possible by calling the choosen name without a $ +// access to a constant is possible by calling the chosen name without a $ echo FOO; // Returns 'something' -echo 'This outputs ' . FOO; // Returns 'This ouputs something' +echo 'This outputs ' . FOO; // Returns 'This outputs something' @@ -132,9 +136,7 @@ echo 'This outputs ' . FOO; // Returns 'This ouputs something' * Arrays */ -// All arrays in PHP are associative arrays (hashmaps), - -// Associative arrays, known as hashmaps in some languages. +// All arrays in PHP are associative arrays (hashmaps in some languages) // Works with all PHP versions $associative = array('One' => 1, 'Two' => 2, 'Three' => 3); @@ -291,7 +293,7 @@ if (false) { print (false ? 'Does not get printed' : 'Does'); // ternary shortcut operator since PHP 5.3 -// equivalent of "$x ? $x : 'Does'"" +// equivalent of "$x ? $x : 'Does'" $x = false; print($x ?: 'Does'); @@ -342,7 +344,7 @@ switch ($x) { $i = 0; while ($i < 5) { echo $i++; -}; // Prints "01234" +} // Prints "01234" echo "\n"; @@ -445,7 +447,7 @@ echo $function_name(1, 2); // => 3 // Or, use call_user_func(callable $callback [, $parameter [, ... ]]); -// You can get the all the parameters passed to a function +// You can get all the parameters passed to a function function parameters() { $numargs = func_num_args(); if ($numargs > 0) { @@ -467,7 +469,7 @@ function variable($word, ...$list) { } } -variable("Separate", "Hello", "World") // Separate || Hello | World | +variable("Separate", "Hello", "World"); // Separate || Hello | World | /******************************** * Includes @@ -796,7 +798,7 @@ But I'm ChildClass /********************** * Magic constants -* +* */ // Get current class name. Must be used inside a class declaration. @@ -824,11 +826,11 @@ echo "Current method is " . __METHOD__; echo "Current namespace is " . __NAMESPACE__; // Get the name of the current trait. Only returns a value when used inside a trait or object declaration. -echo "Current namespace is " . __TRAIT__; +echo "Current trait is " . __TRAIT__; /********************** * Error Handling -* +* */ // Simple error handling can be done with try catch block @@ -839,7 +841,10 @@ try { // Handle exception } -// When using try catch blocks in a namespaced enviroment use the following +// When using try catch blocks in a namespaced environment it is important to +// escape to the global namespace, because Exceptions are classes, and the +// Exception class exists in the global namespace. This can be done using a +// leading backslash to catch the Exception. try { // Do something @@ -856,7 +861,7 @@ try { $condition = true; if ($condition) { - throw new MyException('Something just happend'); + throw new MyException('Something just happened'); } } catch (MyException $e) { @@ -873,6 +878,9 @@ and community input. If you're interested in up-to-date best practices, visit [PHP The Right Way](http://www.phptherightway.com/). +A tutorial covering basics of language, setting up coding environment and making +few practical projects at [Codecourse - PHP Basics](https://www.youtube.com/playlist?list=PLfdtiltiRHWHjTPiFDRdTOPtSyYfz3iLW). + If you're coming from a language with good package management, check out [Composer](http://getcomposer.org/). |