PHP常用功能，php_PHP教程

PHP常用功能，php

1.PHP字符串

• 字符串声明 变量=''或者""（一般情况会使用单引号，因为写起来会比较方便）

<span>$str</span> = 'Hello PHP'<span>;
</span><span>echo</span> <span>$str</span>;

• strpos 计算字符在字符串中的位置（从0开始）

<span>$str</span> = 'Hello PHP'<span>;
</span><span>echo</span> <span>strpos</span>(<span>$str</span>,'o');  <span>//</span><span>计算字符在字符串中的位置</span>
<span>echo</span> '<br/>'<span>;
</span><span>echo</span> <span>strpos</span>(<span>$str</span>,'PH');

• substr 截取字符串 

<span>$str</span> = 'Hello PHP'<span>;
</span><span>//</span><span>截取字符串</span>
<span>$str1</span> = <span>substr</span>(<span>$str</span>,2,3); <span>//</span><span>从2位置开始截取，截取长度为3的字符串</span>
<span>echo</span> <span>$str1</span>;

     不传入长度参数的话，会从指定位置一直截取到字符串的末尾

• str_split 分割字符串  固定长度的分割（默认长度为1）

<span>$str</span> = 'Hello PHP'<span>;
</span><span>//</span><span>分割字符串</span>
<span>$result</span> = <span>str_split</span>(<span>$str</span>);   <span>//</span><span>将结果保存到一个数组中</span>
<span>print_r</span>(<span>$result</span>);  <span>//</span><span>使用print_r输入一个数组</span>
<span>echo</span> '<br/>'<span>;
</span><span>$result1</span> = <span>str_split</span>(<span>$str</span>,2<span>);
</span><span>print_r</span>(<span>$result1</span>);

• explode(分割字符,待分割的字符串) 按照空格进行分割

<span>$str</span> = 'Hello PHP Java C# C++'<span>;
</span><span>$result</span> = <span>explode</span>(' ',<span>$str</span><span>);
</span><span>print_r</span>(<span>$result</span>);

• 字符串的连接

<span>$str</span> = 'Hello PHP Java C# C++'<span>;
</span><span>//</span><span>字符串的连接</span>
<span>$num</span> = 100<span>;
</span><span>$str1</span> = <span>$str</span>.'<br/>Objective-C '.<span>$num</span><span>;
</span><span>echo</span> <span>$str1</span><span>;
</span><span>echo</span> '<br/>'<span>;
</span><span>$str2</span> = "<span>$str</span><br/>Objective-C <span>$num</span>";    <span>//</span><span>另一中简便的写法</span>
<span>echo</span> <span>$str2</span>;

magento(麦进斗)

Magento是一套专业开源的PHP电子商务系统。Magento设计得非常灵活，具有模块化架构体系和丰富的功能。易于与第三方应用系统无缝集成。Magento开源网店系统的特点主要分以下几大类，网站管理促销和工具国际化支持SEO搜索引擎优化结账方式运输快递支付方式客户服务用户帐户目录管理目录浏览产品展示分析和报表Magento 1.6 主要包含以下新特性：•持久性购物 - 为不同的

下载

2.PHP数组

• 数组的声明 PHP的数组动态性非常好，可以存所有类型的数据

<span>//</span><span>数组的声明方式</span>
<span>$arr</span> = <span>array</span><span>();
</span><span>$arr</span>[0] = 'Hello'<span>;
</span><span>$arr</span>[1] = 'World'<span>;
</span><span>$arr</span>[2] = 2<span>;
</span><span>$arr</span>[3] = 3.14<span>;
</span><span>print_r</span>(<span>$arr</span>);

• array_push()//添加一个元素
• array_pop()//删除最后一个元素

<span>$arr</span> = <span>array</span><span>();
</span><span>for</span>(<span>$i</span>=0;<span>$i</span><100;<span>$i</span>++<span>){
    </span><span>array_push</span>(<span>$arr</span>,'Item'.<span>$i</span><span>);
}
</span><span>print_r</span>(<span>$arr</span>);

• 通过键值对（Key-Value）方式存储数据

<span>$arr</span> = <span>array</span><span>();
</span><span>$arr</span>['H'] = 'Hello'<span>;
</span><span>$arr</span>['W'] = 'World'<span>;
</span><span>print_r</span>(<span>$arr</span><span>);
</span><span>echo</span> '<br/>'<span>;
</span><span>echo</span> <span>$arr</span>['H'];

　 输出： 　 Array ( [H] => Hello [W] => World )  　 Hello

• 不仅可以把PHP数组当成一个Array用，还可以当成一个Map用
• 数组初始化

<span>$arr</span> = <span>array</span>('H'=>'Hello','W'=>'World');    <span>//</span><span>PHP数组初始化</span>
<span>print_r</span>(<span>$arr</span>);

• 可以同时存在数组小标，以及键值对

<span>$arr</span> = <span>array</span>(0=>'Make',1=>'Tom','H'=>'Hello','W'=>'World'<span>);
</span><span>print_r</span>(<span>$arr</span><span>);
</span><span>echo</span> '<br/>'<span>;
</span><span>echo</span> <span>$arr</span>[0<span>];
</span><span>echo</span> '<br/>'<span>;
</span><span>echo</span> <span>$arr</span>['W'];

     输出：     Array ( [0] => Make [1] => Tom [H] => Hello [W] => World )  　 Make 　 World