About the use of PHP language!

Last Update:2016-11-29 Source: Internet

Author: User

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</script>--js with PHP is a weakly typed language weakly typed language just does not display the performance definition variable when the system automatically gives default

So you can define variables when you define PHP variables.

---------common statements in PHP:

$a = 10; Based on the value written, the system automatically becomes an int

$b = "Hello"; define a string;

$c = ' Hello '; ibid.

$d = "www{$a}www" inserts other characters into the character

-----"" and "difference"

The escape character can be parsed in double quotation marks, not single quotation mark

Double quotation mark inside can parse variable, single quotation mark not

$e =<<<xxx

XXX;

----Output:

echo $a output statement

Var_dump ($a); the output statement used to test the code

More commonly used

-------Use of PHP

<?php

----OUTPUT statement:

echo "Hello", "world"; can have more than one character at the same time there are more common

print "world"; not commonly used

Print_r (); Output array Information

Var_dump ();//Variables and types

------Common variable types in PHP in theory

int, float, double, bool, char, string

-----There are many similarities to the similarity of C # in PHP in the use of statements

---branch statements

1,if--else

2,if---else if----

3, if (nested)

Course Courseware Script:

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465 66676869707172737475767778798081828384858687888990919293949596979899100101102103 <body><?php//注释/* 多行注释 *///输出语句//echo "hello","helloa";//print "world";//print_r(); //输出数组信息//var_dump();//变量和类型//变量定义//int float bool string//弱类型语言/*$a = 10;$b = "he{$a}llo"; $c = ‘world‘;$d = <<<AAhello "aa" , "bb" ,‘cc‘,<input type="text" value="aa" />AA;*///1.双引号里面可以解析转义字符，单引号不行//2.双引号里面可以解析变量，单引号不行//$e = $a.$c; //拼接字符串用的是.//$f = 10.05;//$f = (string)$f; //类型转换//$f = "hello"; //$aa = "cc";//$cc = "dd";//echo $$aa; //可变变量//$dd = &$aa; //&取地址//$dd = "ee";//echo $aa;//运算符与表达式$a= 10;$b= 4;//echo $a/$b;//echo @$c; //错误抑制符，并不能抑制所有错误//echo $a==$b?"ok":"no"; //三目运算符 /*if($a==$b){ echo "ok";}else{ echo "no";}*/<br>语法//1.if...else...//2.if...else if...//3.if嵌套/*$a = 2;switch($a){ case 1: echo "11111"; break; case 2: echo "222222"; break; case 3: echo "333333"; break; default: echo "444"; break;}*///1.for/*for($i=0;$i<10;$i++){ echo $i."<br>";}*///2.while//3.do...while //echo $e;//var_dump($f);?><script type="text/javascript"></script></body>

Reprint: http://www.cnblogs.com/koker/p/5542708.html

About the use of PHP language!

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