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PHP使用http_build_query()构造URL字符串的方法,httpbuildquery
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PHP使用http_build_query()构造URL字符串的方法,httpbuildquery

Jun 13, 2016 am 08:42 AM
build http php query url

PHP使用http_build_query()构造URL字符串的方法,httpbuildquery

本文实例讲述了PHP使用http_build_query()构造URL字符串的方法。分享给大家供大家参考,具体如下:

简单来说,http_build_query()就是将一个数组转换成url 问号?后面的参数字符串,并且会自动进行urlencode处理。

还是引用一下官方的解释:

http_build_query

http_build_query -- 生成 url-encoded 之后的请求字符串描述string http_build_query ( array formdata [, string numeric_prefix] )

使用给出的关联(或下标)数组生成一个 url-encoded 请求字符串。参数 formdata 可以是数组或包含属性的对象。一个 formdata 数组可以是简单的一维结构,也可以是由数组组成的数组(其依次可以包含其它数组)。如果在基础数组中使用了数字下标同时给出了 numeric_prefix 参数,此参数值将会作为基础数组中的数字下标元素的前缀。这是为了让 PHP 或其它 CGI 程序在稍后对数据进行解码时获取合法的变量名。

还是看一些简单的例子吧:

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$data = array(

    'foo'=>'bar',

    'baz'=>'boom',

    'site'=>'www.nowamagic.net',

    'name'=>'nowa magic');

echo http_build_query($data);

/* output

 foo=bar&baz=boom&cow=milk&php=hypertext+processor

*/

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如果是索引数组与关联数组混合而成的数组又如何呢?

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$data = array(

    'foo',

    'bar',

    'site'=>'www.nowamagic.net',

    'name'=>'nowa magic');

echo http_build_query($data);

/* output

    0=foo&1=bar&site=www.nowamagic.net&name=nowa+magic

*/

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它会自动添加数字索引。

http_build_query 还有一个参数,可以给数字索引加前缀,我们再试试:

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$data = array(

    'foo',

    'bar',

    'site'=>'www.nowamagic.net',

    'name'=>'nowa magic');

echo http_build_query($data, "nm_");

/* output

nm_0=foo&nm_1=bar&site=www.nowamagic.net&name=nowa+magic

*/

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再复杂一些的数组又如何呢?比如二维数组什么的。

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$data = array(

    'user'=>array('name'=>'Bob Smith',

    'age'=>47,

    'sex'=>'M',

    'dob'=>'5/12/1956'),

    'pastimes'=>array('golf', 'opera', 'poker', 'rap'),

    'children'=>array('bobby'=>array('age'=>12,'sex'=>'M'),

    'sally'=>array('age'=>8,'sex'=>'F')),

    'CEO');

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它的输出结果则是:

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user%5Bname%5D=Bob+Smith&user%5Bage%5D=47&user%5Bsex%5D=M&user%5Bdob%5D=5%2F12%2F1956

&pastimes%5B0%5D=golf&pastimes%5B1%5D=opera&pastimes%5B2%5D=poker

&pastimes%5B3%5D=rap&children%5Bbobby%5D%5Bage%5D=12&children%5Bbobby%5D%5Bsex%5D=M

&children%5Bsally%5D%5Bage%5D=8&children%5Bsally%5D%5Bsex%5D=F&0=CEO

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为了可读性对其进行了折行:

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user[name]=Bob+Smith&user[age]=47&user[sex]=M&user[dob]=5%1F12%1F1956&

pastimes[0]=golf&pastimes[1]=opera&pastimes[2]=poker&pastimes[3]=rap&

children[bobby][age]=12&children[bobby][sex]=M&children[sally][age]=8&

children[sally][sex]=F&flags_0=CEO

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注意:只有基础数组中的数字下标元素“CEO”才获取了前缀,其它数字下标元素(如 pastimes 下的元素)则不需要为了合法的变量名而加上前缀。

不只是数组,连对象也能转化为URL字符串:

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class myClass {

  var $foo;

  var $baz;

  function myClass() {

  $this->foo = 'bar';

  $this->baz = 'boom';

  }

}

$data = new myClass();

echo http_build_query($data);

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末尾,再提几个函数,很可能在你搜索 http_build_query 时需要了解的:

1. parse_str:将一个url ?后面的参数转换成一个数组,array parse_str(url,arr)。

2. parse_url:将一个完整的url解析成数组,array parse_url(string url)。

3. http_build_query:再简要解释下,将一个数组转换成url ?后面的参数字符串,会自动进行urlencode处理,string http_build_query ( array formdata [, string numeric_prefix]),后面的给数组中没有指定键或者键为数字的加下标。

更多关于PHP相关内容感兴趣的读者可查看本站专题:《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《PHP基本语法入门教程》、《php操作office文档技巧总结(包括word,excel,access,ppt)》、《php日期与时间用法总结》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

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