PHP - Common

PHP-Common.php

## Start/Stop

  <?php  // StartPHP  
  
  doPHPFunction();
  
  /*
  
  ?> // StopPHP 
  
  */  
  
  <htmlElement attrib="<?php echo $value; ?>" />

## Comments

  # This is a comment
  // This is a comment
  /* This is a comment */
  
## Variables

  $myInt = 1;
  $myArray = [];
  $myArray2 = array();
  $aArray = array( "foo" => "bar" );
  
  const DEFAULT_VALUE = 42;
  
## Properties

  echo $aArray {"foo" }; // bar
  
## Print

  echo "value";  // value
  
  print_r ( $_REQUEST );  
  var_dump ( $_GET );  
  var_dump ( $_POST );  
  print_r ( $_SERVER );  

## Include

  require ("filename.php"); 
  require_once (__DIR__ . "../lib/filename.php");
  
  include ("filename.php"); 
  include_once ("filename.php");
  
## Loop - For count
  
  $count = count($j);
  for ($i = 0; $i < $count; $i++) { 
    //...
  }

## Loop - Value
  
  $myArray = array();
  
  // Loop through values
  foreach( $myArray as $value ) {
    echo $value;
  }
  
## Loop - Key Value Pair

  // Convert of the data from the URL query to an associative Array
  foreach( $_REQUEST as $key => $value ) {
      $myArray { strtolower($key) } = strtolower( $value );
  }
  
  var_dump($myArray);

## Array - Push

   array_push($myArray,$value);
   
## Array - Shuffle

   $randomized = shuffle($myArray);
   
## Array - Pick Random Index -> Value

   $randomValue = $myArray[array_rand($myArray,1)];
   
## Array - Split/Explode  Join/Implode

  $space_separated = "a b c d e";
  $array = explode(" ", $space_separated);
  $comma_separated = implode(",", $array);
  
## Array - Contains

  $array = array ("needle", "a", "b");
  if (in_array("needle", $array)){
    //...
  }
  
## Replace
  $phrase  = "You should eat fruits, vegetables, and fiber every day.";
  $healthy = array("fruits", "vegetables", "fiber");
  $yummy   = array("pizza", "beer", "ice cream")
  $newphrase = str_replace($healthy, $yummy, $phrase);
  
## String Length
  strlen ("12345"); // 5

## Is?

  if (isset($foo) && is_array($foo)) { return $bar; }

## Date/Time

  date_default_timezone_set('America/Los_Angeles');
  $format = "D, d M Y h:m:s A +0000";
  echo date($format);  // Fri, 10 Jan 2014 07:00:00 PM +0000

## Classes - Get/Set

  class A {
      public $foo;
      public function setFoo($bar) { $this->foo = $bar; }
      public function getFoo() { return $this->foo; }
  }
  
  $bat = new A();
  
  // Slower
  $bat->setFoo('baz');
  $baz = $bat->getFoo();
  
  // Faster
  $bat->foo = 'baz';
  $baz = $bat->foo;

## Classes - Constructor
  
  /**
   * KeyValue Class Example
   */
  class KeyValue
  {
    /**
     * @var $key string Description
     * @var $value string Description
     */

      public $key;
      public $value;
  
      /**
       * @param $key string This will be used for the key
       * @param $value string This will be used for the value
       */
      public function __construct($key, $value = "default") {
          $this->key = $key;
          $this->value = $value;
      }
  }
  
  $kv = new KeyValue("myKey", "myValue");
  
  echo $kv->key; // myKey
  echo $kv->value; // myValue

## Classes - Static Functions

  /**
  * Class Common
  */
  class Common
  {
    /**
     * static @var $VERSION string Current version
     */

    public static $VERSION = "1.0.0";

     /**
      * Check to see if a value is empty
      * @param null $value
      * @return bool true if the value is null or empty
      */
      public static function IsNullOrEmpty($value = null)
      {
          return ($value === null || !isset($value) || trim($value) === '' );
      }
  }
  Common::IsNullOrEmpty("A"); // false
  Common::IsNullOrEmpty(null); // true
  Common::$VERSION; // 1.0.0
  
## Header - Redirect

  header('Location: http://www.example.com/');
  
## Header - Content Types

  header("Content-type: text/xml; charset=utf-8");
  header('Content-type: application/javascript');
  header('Content-type: application/json');

## JSON

    $obj = json_decode ('{"foo":"bar"}');
    var_dump ($obj); // object(stdClass)#419 (1) {["foo"]=>string(3) "bar" }

    $json = json_encode ($obj);
    echo $json, "\n"; // {"foo":"bar"}

    $test = json_decode ($json);
    echo $test->foo; // bar

  
## JSONP - Callback

  if ($data)
  {
    if ($_REQUEST['callback']) {
        // jsonp
        header('Content-type: application/javascript');
        echo $_REQUEST['callback'],'(', $data,');';
    } else {
        header('Content-type: application/json');
        echo $data;
    }
  }
  
  
## Errors

  error_reporting(E_ALL); 
  error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
  error_reporting(E_ALL ^ E_NOTICE);
  
  function myErrorHandler($errno, $errstr, $errfile, $errline)
  {
    echo "Error: [$errno] $errstr<br />\n";
  }
  $old_error_handler = set_error_handler("myErrorHandler");
  
  
## XML - XPath

  $xml = new SimpleXMLElement($string);
  
  /* Search for <a><b><c> */
  $result = $xml->xpath('/a/b/c');
  
  while(list( , $node) = each($result)) {
      echo '/a/b/c: ',$node,"\n";
  }
  
## CONSTANTS

  $hasFoo = defined ("FOO");
  if(!$hasFoo) define ("FOO", "BAR");
  $foo = constant ("FOO");

## FILE

$exists = file_exists ( $filename );
$info = pathinfo($filepath);
  

// require vs. include - errors