PHP syntax basics, PHP syntax _php tutorial

PHP syntax basics, PHP syntax

1.PHP Syntax Basics

• $a = 10; Variables can be modified during the run process

$a = ten; $a =; $b = 5; Echo $a+$b;

• Const THE_VALUE = 100; Constants can only be assigned one time, otherwise they will report a syntax error

Const The_value = +; // the_value = 200; error when running with syntax errors Echo The_value;

• Methods for defining constants in PHP4

Define (' The_value ', $); // the_value = 200; syntax error Echo The_value;

2. Function wraps a lot of code blocks of functionality

• Simple functions

function tracehellophp () {    echo ' Hello PHP ';     Echo '
';     Echo ' Hello world '; Tracehellophp ();

• function as a callback function for other functions

function tracehellophp () {    echo ' Hello php--back ';     Echo '
';     Echo ' Hello world '; // tracehellophp (); $func = ' tracehellophp '; $func ();

• Incoming parameters of a function

function SayHello ($name) {    echo ' Hello '.  $name;     Echo '
';} SayHello (' Zhangsan '); SayHello (' Lisi ');

• Functions with multiple incoming parameters

function tracenum ($a,$b) {    echo ' a = '.  $a. ', B = '. $b. '
';     Echo $a $b
";  // It's also possible to write. }tracenum (2,3);

• function with return value

function Add ($a,$b) {    return$a+$b ;} echo Add (10,2). '
';

3. Process Control

• Garbled reason: The encoding of the server and the way the client encodes different solutions: Add the HTML header, and embed the PHP code in the body

    
 
      Control Flow
 
  PHP/**/function getlevel ($score) {    if( $score >=) {        return ' excellent ';    } ElseIf ($score >=) {        return ' good ';    } ElseIf ($score >=) {        return ' good ';    } ElseIf ($score >=) {        return ' can ';    } Else {        return ' bad ';    }} echo getlevel (92). '
';? >

• Control Statement Notation 2

function getlevel_switch ($score) {    switch($score/10) {          Case         9:            return ' excellent ';          Case 8:            return ' good ';          Case 7:            return ' good ';          Case 6:            return ' can ';         default:            return ' bad ';    }} Echo Getlevel_switch (60). '
';

• Control Statement Notation 3

function getlevel_break ($score) {    $result = '--';     Switch (intval($score/10)) {        case         9:            $ Result = ' excellent ';  Break ;          Case 8:            $result = ' good ';  break;          Case 7:            $result = ' good ';  break;          Case 6:            $result = ' may ';  break;    }     return $result ;} Echo Getlevel_break (83). '
';

4. Cycle

• For loop

 for ($i= 0; $i<100; $i+ +)    {echo ' Hello '.  $i. '
';}

• The while loop first judges and executes

$i = 0;  while ($i <) {    echo ' Hello '.  $i. '
';     $i+ +;}

• Do-while Loop first performed in the judgment

$i = 0;  Do {    echo ' Hello '.  $i. '
';     $i+ +;   // do not forget to increase, or you will be programmed to die loop }  while ($i<20);

• Break jumps out * the whole * loop

 for ($i= 0; $i<100; $i+ +)    {echo ' Hello '.  $i. '
';     if $i = = ) {        break;    }}

• Continue Jump * this time * cycle

 for ($i= 0; $i<100; $i+ +)    {echo ' Hello '.  $i. '
'; //     if ($i = =) {//        break;//    }    if$i) {          Continue;    }     Echo ' Run here '. $i. '
';}

5. Logical operation with && or | | | non-!

function Tracenum () {    for($i=0;  $i<=100; $i+ +) {//        if (0 = = $i%2 && 0== $i%3) {//            echo $i. '
';//        }//        if (0 = = $i%2 | | 0== $i%3) {//            echo $i. '
';//        }        if$i%2) {            echo$i. '
';        }    }} Tracenum ();

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