php虽然是弱语言，但是它也有自己的数据类型。php数据类型可分为七种：
- String(字符串类型)
- Boolearn(布尔型)
- Array(数组型)
- Integer(整型)
- Float(浮点型)
- Object(对象类型)
- Null(空值)
1、PHP字符串
字符串是用双引号或单引号给变量加上的一个变量。字符串是php主要的数据结构
<?php
$text = 'hello world';
echo $text;
?> 如何把两个字符串连接起来？
用’ . ‘连接符把两个字符串连接起来,如下：
<?php
$a = 'hello world';
$b ='welcome to china';
echo $a ." " .$b;
?> php字符串内置函数有很多，主要学习查询、截取、替换、添加、删除常用的几个:
- strlen() 返回字符串的长度
- strpos() 函数用于在字符串内查找一个字符或一段指定的文本
- chr() 移除字符串右侧的空白字符或其他字符
- trim () 移除字符串两侧的空白字符和其他字符
- ucfirst() 把字符串中的首字符转换为大写
- ucwords() 把字符串中每个单词的首字符转换为大写
- substr() 返回字符串的一部分
- strtolower() 把字符串转换为小写字母
- strtoupper() 把字符串转换为大写字母
- strrev() 反转字符串
- strip_tags() 剥去字符串中的 HTML 和 PHP 标签
- str_word_count() 计算字符串中的单词数
- strcasecmp() 比较两个字符串
- strchr() 查找字符串在另一字符串中的第一次出现
- substr_replace() 把字符串的一部分替换为另一个字符串
<?php
echo strlen('hello world'); //获取字符串的长度
echo strpos('hello world','world'); //查询world在hello world的位置 ，会输出6
?> 
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