PHP Notes

Following is basic PHP language info, to refresh my memory.

• http://php.net
• php_reference_sheet.pdf

• Like Java, each line needs a semicolon
• Like Java, Comments
  • //
  • /* multi line */
  • # Comment text (unlike Java)

• == (Equal
• === (Equal with type comparison)
• ! (logical NOT), && (logical AND), || (logical OR), xor (logical XOR)

• Data Types: integer, float, boolean, string, array, object, resource, NULL
• $variablename = “hello”;
• $arrayname = array();
• $arrayname = array(“apple”, “pear”, “plum”);
• $arrayname = array(“apple” ⇒ “red”, “pear” ⇒ “yellow”, “plum” ⇒ “purple”);

   if (condition 1) {
      statement 1; }
   elseif (condition 2) {
      statement 2; }
   else {
      statement 3; }

Like Java

   for (<intialize>;<condition>;<update>) {
      statements;
   }

Unlike Java - foreach

  foreach ($arrayname as $arrayitem) {
      statements;
      break;
      continue;
   }
   foreach ($arrayname as $key => $value) {
       statements;
   }

• sort($arrayname); (Sort array assigns new keys)
• asort($arrayname); (Sort array maintain keys)
• rsort($arrayname); (Sort array in reverse, new keys)
• arsort($arrayname); (Sort array in reverse, maintain keys)
• count($array); (Count elements);
• count($array, COUNT_RECURSIVE); (Count multidimensional array);

   function myFunction ($myparam = "default value") {
 
      return "I'm done.";
   }

   class MyClass {
 
      public $myTitle = "hello";
      public function myFunction($myparameter = "default value") {
      }
 
   }

Declare and Use Class

• $variable = new class_name();
• $variable→function_name();
• class_name::function_name(); (Static call)