Php

Misc.

• count($arr) : returns array length
• join($glue, $arr)
• is_null($foo)

Error Log

 cat /var/log/apache2/error.log
 sudo truncate -s 0 /var/log/apache2/error.log
 cat /var/log/apache2/error.log && sudo truncate -s 0 /var/log/apache2/error.log

Dates and Times

 date('Y-m-d H:i:s') //mysql datetime
 date('Y-m-d') //mysql date
 time() returns current unix time
 strtotime($str)

Arrays

 array_key_exists(key,array);
 array_merge

To remove a by key

 unset($arr[$key]);

JSON

 json_decode($str, true);
 json_encode($obj);

The true makes it associative.

Files

 readfile($filename);

Ouputs the file to stdOut.

 file_put_contents($filename, $str);

Write string to file.

Classes

 class Foo{
   public function __construct(){
     ...
   }
 }

Magic Methods

• __get
• __set
• __call