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PHP学习札记(一)

Jun 13, 2016 pm 01:09 PM
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PHP学习笔记(一)

 
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PHP的脚本以结束。在支持简写的服务器上,可以使用来开始和结束脚本块。为了兼容性,尽量使用标准形式。PHP通常会包含HTML标签,就像HTML文件,以及一些PHP脚本代码。下面是一段简单的PHP代码,

<html>

   <?php 

echo "Hello World!"

?>

</html>
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有两种通过PHP来输出文本的基础指令,echo和print.

PHP中所有变量都是以$符号开始的。

设置变量的正确方法是:

$var_name = value;

PHP是一门松散类型的语言,在PHP中,不需要在设置变量之前声明该变量。

根据变量被设置的方式,PHP会自动地把变量转换为正确的数据类型。

在PHP中,变量会在使用时被自动声明。

在PHP中,只有一个字符串运算符。

并置运算符(.)用于把两个字符串连接起来。

如:

$txt1="Hello World";
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$txt2="nihao";
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echo $txt1 . " " . $txt2;
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?>

以上代码输出

Hello World nihao
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strpos() 函数用于在字符串内检索一段字符串或一个字符。
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如果在字符串中找到匹配,该函数会返回第一个匹配的位置。如果未找到匹配,则返回 FALSE。
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如:
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<?php
echo strpos("Hello world!","world");
?>
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返回的是6.(从0开始)


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