<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >hash_init</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="hash Functions" HREF="ref.hash.html"><LINK REL="PREVIOUS" TITLE="hash_hmac" HREF="function.hash-hmac.html"><LINK REL="NEXT" TITLE="hash_update_file" HREF="function.hash-update-file.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.hash-hmac.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.hash-update-file.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.hash-init" ></A >hash_init</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN69578" ></A ><P > (no version information, might be only in CVS)</P >hash_init -- Initialize an incremental hashing context</DIV ><DIV CLASS="refsect1" ><A NAME="AEN69581" ></A ><H2 >Descrição</H2 >resource <B CLASS="methodname" >hash_init</B > ( string algo [, int options, string key] )<BR ></BR ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN69595" ></A ><H2 >Parâmetros</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >algo</CODE ></DT ><DD ><P > Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..) </P ></DD ><DT ><CODE CLASS="parameter" >options</CODE ></DT ><DD ><P > Optional settings for hash generation, currently supports only one option: <TT CLASS="constant" ><B >HASH_HMAC</B ></TT >. When specified, the <CODE CLASS="parameter" >key</CODE > <SPAN CLASS="emphasis" ><I CLASS="emphasis" >must</I ></SPAN > be specified. </P ></DD ><DT ><CODE CLASS="parameter" >key</CODE ></DT ><DD ><P > When <TT CLASS="constant" ><B >HASH_HMAC</B ></TT > is specified for <CODE CLASS="parameter" >options</CODE >, a shared secret key to be used with the HMAC hashing method must be supplied in this parameter. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN69619" ></A ><H2 >Valores de retornado</H2 ><P > Returns a Hashing Context resource for use with <A HREF="function.hash-update.html" ><B CLASS="function" >hash_update()</B ></A >, <A HREF="function.hash-update-stream.html" ><B CLASS="function" >hash_update_stream()</B ></A >, <A HREF="function.hash-update-file.html" ><B CLASS="function" >hash_update_file()</B ></A >, and <A HREF="function.hash-final.html" ><B CLASS="function" >hash_final()</B ></A >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN69626" ></A ><H2 >Exemplos</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN69629" ></A ><P ><B >Exemplo 1. Incremental hashing example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$ctx </font><font color="#007700">= </font><font color="#0000BB">hash_init</font><font color="#007700">(</font><font color="#DD0000">'md5'</font><font color="#007700">);<br /></font><font color="#0000BB">hash_update</font><font color="#007700">(</font><font color="#0000BB">$ctx</font><font color="#007700">, </font><font color="#DD0000">'The quick brown fox '</font><font color="#007700">);<br /></font><font color="#0000BB">hash_update</font><font color="#007700">(</font><font color="#0000BB">$ctx</font><font color="#007700">, </font><font color="#DD0000">'jumped over the lazy dog.'</font><font color="#007700">);<br />echo </font><font color="#0000BB">hash_final</font><font color="#007700">(</font><font color="#0000BB">$ctx</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" >5c6ffbdd40d9556b73a21e63c3e0e904</PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN69634" ></A ><H2 >Veja também</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.hash.html" ><B CLASS="function" >hash()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.hash-file.html" ><B CLASS="function" >hash_file()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.hash-hmac.html" ><B CLASS="function" >hash_hmac()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.hash-hmac-file.html" ><B CLASS="function" >hash_hmac_file()</B ></A ></TD ></TR ></TBODY ></TABLE ><P ></P > </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.hash-hmac.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.hash-update-file.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >hash_hmac</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.hash.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >hash_update_file</TD ></TR ></TABLE ></DIV ></BODY ></HTML >