function.http-build-query.html

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     <tbody valign="middle" class="tbody">
      <tr valign="middle">
       <td colspan="1" rowspan="1" align="left">5.1.2</td>
       <td colspan="1" rowspan="1" align="left">
        The <i><tt class="parameter">arg_separator</tt></i>
 parameter was added.
       </td>
      </tr>

      <tr valign="middle">
       <td colspan="1" rowspan="1" align="left">5.1.3</td>
       <td colspan="1" rowspan="1" align="left">
        Square brackets are escaped.
       </td>
      </tr>

     </tbody>
    </colgroup>

   </table>
  </p>
 </div>


 <div class="refsect1 examples">
  <h3 class="title">Examples</h3>
  <div class="example">
   <p><b>Example #1 Simple usage of <b>http_build_query()</b></b></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$data&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'baz'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'boom'</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'cow'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'milk'</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'php'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'hypertext&nbsp;processor'</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">http_build_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;foo=bar&amp;baz=boom&amp;cow=milk&amp;php=hypertext+processor<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">http_build_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">''</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'&amp;amp;'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;foo=bar&amp;amp;baz=boom&amp;amp;cow=milk&amp;amp;php=hypertext+processor<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>

  <div class="example">
   <p><b>Example #2 <b>http_build_query()</b> with numerically index elements.</b></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$data&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'baz'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'boom'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'cow'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #DD0000">'milk'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'php'&nbsp;</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'hypertext&nbsp;processor'</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">http_build_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">http_build_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'myvar_'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>The above example will output:</p></div>
   <div class="example-contents"><pre>
<div class="cdata"><pre>
0=foo&amp;1=bar&amp;2=baz&amp;3=boom&amp;cow=milk&amp;php=hypertext+processor
myvar_0=foo&amp;myvar_1=bar&amp;myvar_2=baz&amp;myvar_3=boom&amp;cow=milk&amp;php=hypertext+processor
</pre></div>
   </pre></div>
  </div>
  <div class="example">
   <p><b>Example #3 <b>http_build_query()</b> with complex arrays</b></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$data&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #DD0000">'user'</span><span style="color: #007700">=&gt;array(</span><span style="color: #DD0000">'name'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'Bob&nbsp;Smith'</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'age'</span><span style="color: #007700">=&gt;</span><span style="color: #0000BB">47</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'sex'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'M'</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'dob'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'5/12/1956'</span><span style="color: #007700">),<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'pastimes'</span><span style="color: #007700">=&gt;array(</span><span style="color: #DD0000">'golf'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'opera'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'poker'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'rap'</span><span style="color: #007700">),<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'children'</span><span style="color: #007700">=&gt;array(</span><span style="color: #DD0000">'bobby'</span><span style="color: #007700">=&gt;array(</span><span style="color: #DD0000">'age'</span><span style="color: #007700">=&gt;</span><span style="color: #0000BB">12</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'sex'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'M'</span><span style="color: #007700">),<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'sally'</span><span style="color: #007700">=&gt;array(</span><span style="color: #DD0000">'age'</span><span style="color: #007700">=&gt;</span><span style="color: #0000BB">8</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'sex'</span><span style="color: #007700">=&gt;</span><span style="color: #DD0000">'F'</span><span style="color: #007700">)),<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">'CEO'</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">http_build_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'flags_'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>
    this will output : (word wrapped for readability)
   </p></div>
   <div class="example-contents"><pre>
<div class="cdata"><pre>
user%5Bname%5D=Bob+Smith&amp;user%5Bage%5D=47&amp;user%5Bsex%5D=M&amp;
user%5Bdob%5D=5%2F12%2F1956&amp;pastimes%5B0%5D=golf&amp;pastimes%5B1%5D=opera&amp;
pastimes%5B2%5D=poker&amp;pastimes%5B3%5D=rap&amp;children%5Bbobby%5D%5Bage%5D=12&amp;
children%5Bbobby%5D%5Bsex%5D=M&amp;children%5Bsally%5D%5Bage%5D=8&amp;
children%5Bsally%5D%5Bsex%5D=F&amp;flags_0=CEO
</pre></div>
   </pre></div>
   <div class="example-contents"><p>
    <blockquote><p><b class="note">Note</b>: 
     
      Only the numerically indexed element in the base array &quot;CEO&quot; received a
      prefix.  The other numeric indices, found under pastimes, do not
      require a string prefix to be legal variable names.
     <br />
    </p></blockquote>
   </p></div>
  </div>

  <div class="example">
   <p><b>Example #4 Using <b>http_build_query()</b> with an object</b></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">class&nbsp;</span><span style="color: #0000BB">myClass&nbsp;</span><span style="color: #007700">{<br />&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;</span><span style="color: #0000BB">$foo</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;</span><span style="color: #0000BB">$baz</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">myClass</span><span style="color: #007700">()&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$this</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">foo&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$this</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">baz&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'boom'</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />}<br /><br /></span><span style="color: #0000BB">$data&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">myClass</span><span style="color: #007700">();<br /><br />echo&nbsp;</span><span style="color: #0000BB">http_build_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;foo=bar&amp;baz=boom<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </div>


 <div class="refsect1 seealso">
  <h3 class="title">See Also</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><a href="function.parse-str.html" class="function" rel="rdfs-seeAlso">parse_str()</a></li>
    <li class="member"><a href="function.parse-url.html" class="function" rel="rdfs-seeAlso">parse_url()</a></li>
    <li class="member"><a href="function.urlencode.html" class="function" rel="rdfs-seeAlso">urlencode()</a></li>
    <li class="member"><a href="function.array-walk.html" class="function" rel="rdfs-seeAlso">array_walk()</a></li>
   </ul>
  </p>
 </div>


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