2

3

4

7

9

header()

headers()

headers_list()

headers_sent()

array( " A " , " B " ,C " ,1,2,3)

array(1,2,3, " A " , " B " ,C " )

array( " A " = > 1, " B " = > 2, " C " = > 3)

array(1= > " A " ,2= > " B " ,3= > " C " )

array(1,2,3)

file_put_contents( " file " , " data " , " a " );

file_put_contents( " file " , " a " , " data " );

file_put_contents( " file " , " data " , FILE_APPEND);

file_put_contents( " file " , " a " , NULL, FILE_APPEND);

function x ($x1 = array())

function x (A $x1)

function x (A $x1 = null)

function x ($x1 = $x2)

autoload()

__autoload()

__catch()

load()

loadClass()

guarantee high performance

secure data consistency

secure access to the database

reduce the database server overhead

reduce code size in PHP

save()

saveFile()

saveXML()

saveHTML()

saveHTMLFile()

Analysing of nearly any aspect of classes and interfaces

Analysing of nearly any aspect of functions

Adding class methods

Implement dynamic construction (new with variable class name)

Yes

No

Only if the class is defined as an abstract