<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >array_diff_key</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Arrays" HREF="ref.array.html"><LINK REL="PREVIOUS" TITLE="array_diff_assoc" HREF="function.array-diff-assoc.html"><LINK REL="NEXT" TITLE="array_diff_uassoc" HREF="function.array-diff-uassoc.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.array-diff-assoc.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.array-diff-uassoc.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.array-diff-key" ></A >array_diff_key</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN10338" ></A ><P > (PHP 5 >= 5.1.0RC1)</P >array_diff_key -- Computes the difference of arrays using keys for comparison</DIV ><DIV CLASS="refsect1" ><A NAME="AEN10341" ></A ><H2 >Description</H2 >array <B CLASS="methodname" >array_diff_key</B > ( array array1, array array2 [, array ...] )<BR ></BR ><P > <B CLASS="function" >array_diff_key()</B > returns an array containing all the values of <CODE CLASS="parameter" >array1</CODE > that have keys that are not present in any of the other arguments. Note that the associativity is preserved. This function is like <A HREF="function.array-diff.html" ><B CLASS="function" >array_diff()</B ></A > except the comparison is done on the keys instead of the values. </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN10360" ></A ><P ><B >Exemplo 1. <B CLASS="function" >array_diff_key()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$array1 </font><font color="#007700">= array(</font><font color="#DD0000">'blue' </font><font color="#007700">=> </font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#DD0000">'red' </font><font color="#007700">=> </font><font color="#0000BB">2</font><font color="#007700">, </font><font color="#DD0000">'green' </font><font color="#007700">=> </font><font color="#0000BB">3</font><font color="#007700">, </font><font color="#DD0000">'purple' </font><font color="#007700">=> </font><font color="#0000BB">4</font><font color="#007700">);<br /></font><font color="#0000BB">$array2 </font><font color="#007700">= array(</font><font color="#DD0000">'green' </font><font color="#007700">=> </font><font color="#0000BB">5</font><font color="#007700">, </font><font color="#DD0000">'blue' </font><font color="#007700">=> </font><font color="#0000BB">6</font><font color="#007700">, </font><font color="#DD0000">'yellow' </font><font color="#007700">=> </font><font color="#0000BB">7</font><font color="#007700">, </font><font color="#DD0000">'cyan' </font><font color="#007700">=> </font><font color="#0000BB">8</font><font color="#007700">);<br /><br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">array_diff_key</font><font color="#007700">(</font><font color="#0000BB">$array1</font><font color="#007700">, </font><font color="#0000BB">$array2</font><font color="#007700">));<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ><P >O exemplo acima irá imprimir:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >array(2) { ["red"]=> int(2) ["purple"]=> int(4) }</PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > The two keys from the <TT CLASS="literal" >key => value</TT > pairs are considered equal only if <TT CLASS="literal" >(string) $key1 === (string) $key2 </TT >. In other words a strict type check is executed so the string representation must be the same. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Nota: </B > Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using <TT CLASS="literal" >array_diff_key($array1[0], $array2[0]);</TT >. </P ></BLOCKQUOTE ></DIV ><P > See also <A HREF="function.array-diff.html" ><B CLASS="function" >array_diff()</B ></A >, <A HREF="function.array-udiff.html" ><B CLASS="function" >array_udiff()</B ></A > <A HREF="function.array-diff-assoc.html" ><B CLASS="function" >array_diff_assoc()</B ></A >, <A HREF="function.array-diff-uassoc.html" ><B CLASS="function" >array_diff_uassoc()</B ></A >, <A HREF="function.array-udiff-assoc.html" ><B CLASS="function" >array_udiff_assoc()</B ></A >, <A HREF="function.array-udiff-uassoc.html" ><B CLASS="function" >array_udiff_uassoc()</B ></A >, <A HREF="function.array-diff-ukey.html" ><B CLASS="function" >array_diff_ukey()</B ></A >, <A HREF="function.array-intersect.html" ><B CLASS="function" >array_intersect()</B ></A >, <A HREF="function.array-intersect-assoc.html" ><B CLASS="function" >array_intersect_assoc()</B ></A >, <A HREF="function.array-intersect-uassoc.html" ><B CLASS="function" >array_intersect_uassoc()</B ></A >, <A HREF="function.array-intersect-key.html" ><B CLASS="function" >array_intersect_key()</B ></A > and <A HREF="function.array-intersect-ukey.html" ><B CLASS="function" >array_intersect_ukey()</B ></A >. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.array-diff-assoc.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.array-diff-uassoc.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >array_diff_assoc</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.array.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >array_diff_uassoc</TD ></TR ></TABLE ></DIV ></BODY ></HTML >