1 What is PHPPHP (Hypetext Preprocessor) hypertext preprocessor, is a server-side, cross-platform, HTML embedded scripting language, its unique syntax mixed with the C language, Java language and Perl language features, only a widely used Kaiyuan multi-purpose scripting language, Especially suitable for web development.
2. Browser-to-server relationships
3.
the data type in JS
String number Boolean null defined
Object (Array Math Date RegExp Object number String Boolean Funtion Error) 4.
creation of one-dimensional arrays and two-dimensional arraysA two-dimensional array is an array that is nested in a one-dimensional array
var arr = [];
arr[0] = [n/a];
arr[1] = [4,5,6];
arr[2] = [7,8,9];
function Eacharr () {
For (var i = 0; i < arr.length; i++) {
For (var j = 0; J < Arr[i].length; J + +) {
Console.log (arr[i][j]+ "<br/>");
}
}
}
Eacharr (arr);
5.PHP Code
- Naming rules: Starting with $
- All PHP code must be written to the inside of the tag
- PHP is also a weakly typed language
- Use echo when outputting.
$num = 123;
Echo $num;//echo represents output (output to a static page)
- <br/> for PHP to be swapped
echo ' <br/> '; Swap lines
6.PHP Arrays
- Count---php built-in functions to calculate the length of the array
$arr = Array (123,456,789);
For ($i = 0; $i < count ($arr); $i + +) {
echo $arr [$i];
}
foreach ($arr as $k = = $v) {
echo $k;//index of the array
echo ' <br/> ';//Swap
echo $v;//values corresponding to the array index}
- PHP array output printing in two ways---mainly for debugging
Print array Information
Print_r ($arr);
$arr = Array (+/-);
Print_r ($arr);Array ([0] = 1 [1] = 2 [2] = 3)
var_dump ($arr);-----more than Print_r () printed
Var_dump ($arr);Printing results:
Array
(size=3)0=
int11=
int22=
int3
7.PHP Common built-in functionsCount-----echo count ($arr 2);
- Array_push (); Append an element to the end of the array
Array_pop (); Go to the last element after the coarse array echo; output Print_r (); Print array information var_dump ();//print array information, more details
8. Associative Arrays$arr = Array (1,2,3,4); $arr = Array (' attr1 ' = ' hello ', ' attr2 ' = ' Hi ', ' attr3 ' = ' Nihao ');
two ways to define a 9.PHP array$arr = array, $arr [] = 1; $arr [] = 2; $arr [] = 3;
10.PHP Two-dimensional array
(1)
$arr = Array (
Array (+/-),
Array (1,2,3,4),
Array (1,2,3,4,5)
);(2)
$arr 1[] = Array (n/a);
$arr 1[] = array (11,22,33);
$arr 1[] = array (111,222,333);
$arr 1[] = array (1111,2222,3333,44444);
- Looping through two-dimensional arrays
(1) For loop traversal PHP two-dimensional array
For ($i = 0; $i < count ($arr); $i + +) {
For ($j = 0; $j < count ($arr [$i]); $j + +) {
echo $arr [$i] [$j]. ' = = = = = ";
}
}
echo ' <br> ';(2) Foreach Loop
foreach ($arr as $value) {
foreach ($value as $VV) {
echo $vv. '-----';
}
}
the string concatenation in 11.PHP is used.
echo $str. '----- -----'. $num;Hello----------123
12.PHP the difference between single and double quotation marks
- Double quotes parse variables in a string
- Single quotes do not resolve variables in quotation marks
$num = 123;
$str = ' Hello ';
echo $str. '----- -----' $num;//hello----------123
echo ' <br/> ';
echo ' Hello $num ';//hello $num
echo "Hello $num";//hello 123
declaration of functions in 13.PHP
<?php
function F1 ($n) {
$sum = 0;
For ($i = 0; $i <= $n; $i + +) {
$sum + = $i;
}
return $sum;
}
$result = F1 (+);
echo ' <div> ' $result. ' </div> ';
?>14 If there is garbled at the beginning of the header (' Content-type:text/html;charset=utf-8 '); ----function: tells the browser to receive this page, as the page page display and use UTF-8 encoding displayheader (' content-type:text/html; Charset=utf-8 ');
15. The server gets the parameters that the client passed over(1) Get (2) post$_get[' parameter name ']$_post[' parameter name '] form form The default request method is get---query with GET request all the data is passed the parameter format after the URL parameter:? parameter name = argument value & parameter name = Parameter value GET request delivery of a limited number of stacks: 8,000 characters Form form submission can be method property specified (Get or post) from the form of the post-submitted data is submitted as a request body, there is no data in the URL post is generally used for a large number of data submissions
request methods supported by the HTTP protocol (common)Get query data Post add data put update data delete delete data
16 Case: The server gets the parameters passed by the client.
<form action= "06me.php" method= "get" >
User name: <input type= "text" name= "username" ><br><br>
Password: <input type= "password" name= "password" ><br>
<input type= "Submit" value= "Submission" >
</form>
<?php
$uname = $_get[' username ');
$pwd = $_get[' password ');
//$uname = $_post[' username ');
//$pwd = $_post[' password ');
if ($uname = = ' Admin ' && $pwd = = ' 123 ') {
echo ' login success ';
}
else {
Echo ' User name or password error ';
}
?>
18 Request mode and path(1) The way the front-end sends the request form the Action property of the A tag of the href attribute of the script tag of the SRC attribute of the link tag's href attribute to the SRC attribute of the img tag location.href = URL address (2) The current path and root path (absolute path) The current path./or omit the upper path: /absolute path (root path)) (http://my.com/)
19 two ways to dynamically generate static content in a page(1)
<?php
$arr = Array (' Orange ', ' apple ', ' banana ');
?>
<div> Fruit List </div>
<ul>
<?php
foreach ($arr as $key = = $value) {
echo ' <li> ' $key. ' ----'. $value. ' </li> ';
}
?>
</ul>
(2)
<div> Animal List </div>
<?php
$arr 2 = Array (' Dog ', ' pink ', ' mouse ');
?>
<ul>
<?php
foreach ($arr 2 as $v) {
?>
<li><?php echo $v?></li>
<?php
}
?>
PHP Initial Knowledge
