ajax--php basic Knowledge (II.)

Header

Header ('content-type:text/html; charset= utf-8'); // set the encoding format to: Utf-8header ('location:http://www.baidu.com'); // set jump to Baidu homepage header ('refresh:3; url=http://www.xiaomi.com'); // Set page interval refresh

Data type

<?PHPHeader("Content-type:text/html;charset=utf-8");//Browser Rendering Format    $num= 1;//Plastic Surgery    $str= "Hello ha";//character    $float= 3.1415926;//floating point    $bool=true;//Boolean    Echo $num; Echo"<br>"; Echo $str; Echo"<br>"; Echo $float; Echo"<br>"; Echo $bool;?>

An expression

<?PHPHeader("Content-type:text/html;charset=utf-8"); //If Judgment    $num=1; if($num==1){        EchoCorrect; }Else{        EchoError; }    Echo"<br>"; //Switch Expression    $day= "Monday"; Switch($day){         Case"Monday":Echo"Work 1";  Break;  Case"Tuesday":Echo"Work 2";  Break; default:EchoSeating;  Break; }    Echo"<br>"; //For Loop     for($i= 0;$i<10;$i++){        Echo"For Loop".$i; Echo"<br>"; }    Echo"<br>"; //While Loop     while($num<10){        Echo"While Loop".$num; Echo"<br>"; $num++; }    Echo"<br>"; // Break    $n=1;  while($n<10){        Echo"While Loop".$n; Echo"<br>"; if($n==5){            Echo"Equals 5, stops, jumps out of the loop"; Echo"<br>";  Break; }        $n++; }    Echo"<br>"; //Three -dimensional expression    $answer=$num>0? " 1 greater than 0 ":" 1 less than 0 "; Echo $answer;?>

Array

<?PHPHeader("Content-type:text/html;charset=utf-8"); $arr=Array(1,2,3,4,5,6);//Array    Echo $arr[3]; Echo"<br>"; $FOODARR=Array("Scrambled eggs with tomatoes", "shredded potatoes", "braised pork ribs", "Red chicken nuggets");//Array    Echo $FOODARR[2]; Echo"<br>"; $persom=Array("Name" = "Wq", "Age" =>16, "skill" = "eat");//relational Arrays (JSON-like)    Echo $persom["Name"]; Echo"<br>"; Echo $persom["Age"]; Echo"<br>"; Echo $persom["Skill"];?>

Single double quotes

<? PHP     Header ("Content-type:text/html;charset=utf-8");     // double Quotes output variables (if the variable exists), single quotes do not output variables    $person= "You are a good person";     Echo "$person";     Echo "<br>";     Echo ' $person '; ?>

GET

<? PHP     Header ("Content-type:text/html;charset=utf-8");     Echo $_get ["UserName"];? >

POST

<? PHP     Header ("Content-type:text/html;charset=utf-8");     Echo $_post ["UserName"];? >

Embedded in HTML

<!    DOCTYPE html>{padding: 0; Margin: 0; } div{Width:500px; Margin:100px Auto; } ul{List-style:none; } li{float:Left ; Width:100px; Height:30px; Background-color:rgba (255,255,156,0.7); Text-align:Center; Line-height:30px; }    </style>PHPEcho $_get["UserName"]; ?> </li> <li> <?PHPEcho $_get["PWD"]; ?> </li> </ul></div></body>
Precautions
1, stitching string is used. Instead of +
2. When submitting a form, it is best to access it in 127.0.0.1
3, the name of the PHP file can not appear in Chinese
ajax--php basic Knowledge (II.)