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Things to know about PHP before going into an interview or exam.

$_GET[]

An array of variables passed in the URL

$_POST[]

An array of variables passed with <input /> data

mysql_fetch_object()

Similar to mysql_fetch_array(), but cannot be accessed by integer offset

mysql_fetch_array()

Returns an array that corresponds to the fetched row of MySQL data and moves the internal data pointer ahead

Shebang

The name of the #! used to designate the location of the PHP binary—this is used to make scripts executable at the command line

define()

Uses two arguments: constant name and constant definition

$_SESSION[]

The array that stores variables specific to a user's visit

Magic Constant

Predefined constants such as __LINE__, __FILE__, __FUNCTION__, __CLASS__ and __METHOD__

$$

The prefix for a dynamic variable, also known as a variable variable

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