20160408-php Process Control and functions

Process Control:

I. Branching structure

If...elseif...elseif...elseswitch...case...break

Two. Cycle control

For

While

Three. Abort the loop

End this layer loop

Break

End this cycle

Continue

Four. Abort the script

1. Exit ();

2. Die ();

Function:

Language structure

Custom functions

Parameters

Default parameters

function return value

Variable number of parameters

Variable function

Variable scope

Reference parameters

callback function

static variables

file contains

Recursive functions

Function Classification:

1. Custom functions

2. callback function

3. Variable function

4. Recursive functions

Language structure:

if ()

for ()

while ()

Switch ()

Echo ()

Print ()

Array ()

List ()

foreach ()

Isset ()

Unset ()

Empty ()

Exit ()

Die ()

Include ()

Require ()

Custom functions:

function Fun () {}

Call Function:

Fun ();

Parameters:

Fun (3, "red");

Default parameters:

Function Show ($num =9, $color = "Red") {echo $num; Echo $color; } The result of the function: 1. Output 2. Returns the result variable number of parameters: 1.func_get_args ();  2.func_num_args (); Variable function: $a = "sum";  $a (); Variable scope: 1. Variables outside the global variables function are global variables 2. Variables inside a local variable function are local variables the Global keyword is modified to make the local variable reference parameter: 1. The inside and outside of the function points to the address of the same variable, changing the value of the variable inside the function,  Outside of the function, the callback function is also changed: the parameter of 1 function is the name of another function, then this parameter is called the callback function; Static variables: Multiple calls to the same function, static variables can be tracked down

The file contains:

1. Include () contains an error script to continue execution

2. Require () If the error file aborts execution

Recursive functions:

function to call this function, from top to bottom to see the code

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20160408-php Process Control and functions