<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >version_compare</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="PHP Opções e Informações" HREF="ref.info.html"><LINK REL="PREVIOUS" TITLE="sys_get_temp_dir" HREF="function.sys-get-temp-dir.html"><LINK REL="NEXT" TITLE="zend_logo_guid" HREF="function.zend-logo-guid.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.sys-get-temp-dir.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.zend-logo-guid.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.version-compare" ></A >version_compare</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN178308" ></A ><P > (PHP 4 >= 4.1.0, PHP 5)</P >version_compare -- Compares two "PHP-standardized" version number strings</DIV ><DIV CLASS="refsect1" ><A NAME="AEN178311" ></A ><H2 >Descrição</H2 >mixed <B CLASS="methodname" >version_compare</B > ( string version1, string version2 [, string operator] )<BR ></BR ><P > <B CLASS="function" >version_compare()</B > compares two "PHP-standardized" version number strings. This is useful if you would like to write programs working only on some versions of PHP. </P ><P > The function first replaces <TT CLASS="literal" >_</TT >, <TT CLASS="literal" >-</TT > and <TT CLASS="literal" >+</TT > with a dot <TT CLASS="literal" >.</TT > in the version strings and also inserts dots <TT CLASS="literal" >.</TT > before and after any non number so that for example '4.3.2RC1' becomes '4.3.2.RC.1'. Then it splits the results like if you were using explode('.', $ver). Then it compares the parts starting from left to right. If a part contains special version strings these are handled in the following order: <TT CLASS="literal" >dev</TT > < <TT CLASS="literal" >alpha</TT > = <TT CLASS="literal" >a</TT > < <TT CLASS="literal" >beta</TT > = <TT CLASS="literal" >b</TT > < <TT CLASS="literal" >RC</TT > < <TT CLASS="literal" >pl</TT >. This way not only versions with different levels like '4.1' and '4.1.2' can be compared but also any PHP specific version containing development state. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN178340" ></A ><H2 >Parâmetros</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >version1</CODE ></DT ><DD ><P > First version number. </P ></DD ><DT ><CODE CLASS="parameter" >version2</CODE ></DT ><DD ><P > Second version number. </P ></DD ><DT ><CODE CLASS="parameter" >operator</CODE ></DT ><DD ><P > If you specify the third optional <CODE CLASS="parameter" >operator</CODE > argument, you can test for a particular relationship. The possible operators are: <TT CLASS="literal" ><</TT >, <TT CLASS="literal" >lt</TT >, <TT CLASS="literal" ><=</TT >, <TT CLASS="literal" >le</TT >, <TT CLASS="literal" >></TT >, <TT CLASS="literal" >gt</TT >, <TT CLASS="literal" >>=</TT >, <TT CLASS="literal" >ge</TT >, <TT CLASS="literal" >==</TT >, <TT CLASS="literal" >=</TT >, <TT CLASS="literal" >eq</TT >, <TT CLASS="literal" >!=</TT >, <TT CLASS="literal" ><></TT >, <TT CLASS="literal" >ne</TT > respectively. Using this argument, the function will return <TT CLASS="constant" ><B >TRUE</B ></TT > if the relationship is the one specified by the operator, <TT CLASS="constant" ><B >FALSE</B ></TT > otherwise. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN178376" ></A ><H2 >Valores de retornado</H2 ><P > <B CLASS="function" >version_compare()</B > returns -1 if the first version is lower than the second, 0 if they are equal, and +1 if the second is lower. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN178380" ></A ><H2 >Exemplos</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN178383" ></A ><P ><B >Exemplo 1. <B CLASS="function" >version_compare()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">// prints -1<br /></font><font color="#007700">echo </font><font color="#0000BB">version_compare</font><font color="#007700">(</font><font color="#DD0000">"4.0.4"</font><font color="#007700">, </font><font color="#DD0000">"4.0.6"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// these all print 1<br /></font><font color="#007700">echo </font><font color="#0000BB">version_compare</font><font color="#007700">(</font><font color="#DD0000">"4.0.4"</font><font color="#007700">, </font><font color="#DD0000">"4.0.6"</font><font color="#007700">, </font><font color="#DD0000">"<"</font><font color="#007700">);<br />echo </font><font color="#0000BB">version_compare</font><font color="#007700">(</font><font color="#DD0000">"4.0.6"</font><font color="#007700">, </font><font color="#DD0000">"4.0.6"</font><font color="#007700">, </font><font color="#DD0000">"eq"</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN178387" ></A ><H2 >Notas</H2 ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Nota: </B > The <TT CLASS="constant" ><B >PHP_VERSION</B ></TT > constant holds current PHP version. </P ></BLOCKQUOTE ></DIV ></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.sys-get-temp-dir.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.zend-logo-guid.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >sys_get_temp_dir</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.info.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >zend_logo_guid</TD ></TR ></TABLE ></DIV ></BODY ></HTML >