PHP (i)

PHP (Hypertext preprocessor Hypertext Preprocessor)

1. Tools such as environmental tools XAMPP

　　

2.apache Configuration

The default Apache path is the C:/xampp/apache folder

You can modify the root configuration to your project's folder for ease of use

The path is as follows (requires restarting Apache to take effect after modification)

the paths that need to be modified are as follows (the two paths are unified)

　　

expand modify localhost local masquerading domain name

3. Syntax

PHP file defaults to. php End

Start with <?php end With ?> (omit?> if no other language ends)

The end of each line must have; End otherwise error

　　Echo

　　　　echo outputs strings to the page for debugging purposes (only output strings, output other error)

　　Stitching strings

Use. Stitching strings

　Variable

Case-sensitive with ' $ + variable name ' beginning with letter or underscore

　　Constant　

A low version with the Define () function defines a type that can be defined with a Boolean integer float and a String

Define (' HAHA ', ' aha haha ');    // the defined constant name is the uppercase string echo HAHA;        // The output of the constant name is also capitalized

A high version can be defined with a const definition with the ES6

Notes

Same as JS //Single line comment/**/paragraph comment

　　Delimiter

$str = <<<EOD //eod is random, as long as it's consistent with the back, it's written here. Output  can be output when output
Keep indent EOD; End and start  must stick to the left of the write

echo "<pre>"; Keep formatting
echo $str;//Pay attention to recommended writing? > End  If you do not write the end, do not have a blank space  will be error

　　Array

<? PHP
  $hero Array (' mage ' = ' ann ', ' tank ' = ' Cheng '); // defines an array of low version 5. Few, no 6. Several versions of the $hero = [' Mage ' and ' Ann ', ' tank ' = ' golden ') ' the method for defining an array after the//5.4 version   is now 7.  Echo ' <pre> ';   // formatted output for easy observation  Print_r ($hero// print array  Var_dump ($hero// print belt type ?>

　　　　Multidimensional arrays

　　

$hero = [  '    mage ' = [' Ann's ', ' N '    ,    ' Wang Zhaojun ',    ],  ' tank ' = > [    ' cheng Bite Gold ',    ' Xiang Yu ',    ' Zhang Fei ',  ],]; $fashi $hero [' Mage ']; Print_R ($fashi);

Iterating through an array

one-dimensional arrays

 <? php   $hero  = [' ann ', ' Chen Bites ', ' Xiang Yu ']; //   defines an array  for  ( $i  = 0;  $i  < count  (  $hero );  $i  ++ echo  "<li>".  $hero  [ $i ]. " </li> "; //  }; ? 

<? PHP $hero = [' mage ' = ' ann ', ' tank ' = ' chen Bite Gold ']; // Defining Arrays  foreach ($heroas$key$value)    {//foreach loop this with more Echo $key $value . ' <br> ';  }? >

　　　　Multidimensional arrays

  $hero= [    ' Mage ' =[      ' Anne-La ', ' Wang Zhaojun ', '      ], ' tank ' = [      ' Cheng Jin ', ' Xiang Yu ', ' Zhang Fei ',    ],  ]; foreach($hero  as $leixing=$list) {    Echo' <br> '.$leixing. ' <br> '; //For ($i = 0; $i < count ($list); $i + +) {//Echo $list [$i]; // }    foreach($list  as $name) {      Echo' Name '.$name; }  }?>

　　PHP page and HTML page mixed line color gehuanghuanse.php

<! DOCTYPE html>pink{Background:Pink; } tableTrtd{Border:1px solid red; }  </style>PHP for($i= 0;$i< 20;$i++) {    ?> <tr <?phpif($i% 2 = = = 0) {Echo"Class= ' Pink '";}? >> <td>00</td> <td>01</td> <td>02</td> &LT;TD&GT;04&LT;/TD&G    T </tr> <?php}; ?> </table></body>
　　Custom functions
<? PHP   function Fun ($name) {    echo ' run '. $name;  } Fun (' Wei bin '); // ===>run?>
　　Simple Object-oriented
<? PHP   class Foo  {    publicfunction  fun1 () {      echo ' fun1 ';    }     Static function fun2 () {      echo ' fun2 ';    }  }   var New Foo;  Ofoo, fun1 ();  Ofoo, fun2 ();? >
　A simple API
<?PHP//User Information  classUser { Public Static functioninfo () {$info= [        ' id ' = 1, ' name ' = ' weibin ', ' age ' = ' ', ' password ' = ' 123456 ', ' sex ' = ' 1 ',      ]; returnJson_encode ($info); Json_encode () encoding Json_decode () decoding}}$userinfo= User::info (); A static class can be used without a new direct:: To accessPrint_r($userinfo);?>
PHP (i)