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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.printf">
<refnamediv>
<refname>printf</refname>
<refpurpose>Output a formatted string</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>printf</methodname>
<methodparam><type>string</type><parameter>format</parameter></methodparam>
<methodparam rep="repeat"><type>mixed</type><parameter>values</parameter></methodparam>
</methodsynopsis>
<simpara>
Produces output according to <parameter>format</parameter>.
</simpara>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&strings.parameter.format;
<varlistentry>
<term><parameter>values</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the length of the outputted string.
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
&strings.errors.sprintf;
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
&strings.changelog.sprintf;
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>printf</function>: various examples</title>
<programlisting role="php">
<![CDATA[
<?php
$n = 43951789;
$u = -43951789;
$c = 65; // ASCII 65 is 'A'
// notice the double %%, this prints a literal '%' character
printf("%%b = '%b'\n", $n); // binary representation
printf("%%c = '%c'\n", $c); // print the ascii character, same as chr() function
printf("%%d = '%d'\n", $n); // standard integer representation
printf("%%e = '%e'\n", $n); // scientific notation
printf("%%u = '%u'\n", $n); // unsigned integer representation of a positive integer
printf("%%u = '%u'\n", $u); // unsigned integer representation of a negative integer
printf("%%f = '%f'\n", $n); // floating point representation
printf("%%o = '%o'\n", $n); // octal representation
printf("%%s = '%s'\n", $n); // string representation
printf("%%x = '%x'\n", $n); // hexadecimal representation (lower-case)
printf("%%X = '%X'\n", $n); // hexadecimal representation (upper-case)
printf("%%+d = '%+d'\n", $n); // sign specifier on a positive integer
printf("%%+d = '%+d'\n", $u); // sign specifier on a negative integer
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
%b = '10100111101010011010101101'
%c = 'A'
%d = '43951789'
%e = '4.39518e+7'
%u = '43951789'
%u = '4251015507'
%f = '43951789.000000'
%o = '247523255'
%s = '43951789'
%x = '29ea6ad'
%X = '29EA6AD'
%+d = '+43951789'
%+d = '-43951789'
]]>
</screen>
</example>
<example>
<title><function>printf</function>: string specifiers</title>
<programlisting role="php">
<![CDATA[
<?php
$s = 'monkey';
$t = 'many monkeys';
printf("[%s]\n", $s); // standard string output
printf("[%10s]\n", $s); // right-justification with spaces
printf("[%-10s]\n", $s); // left-justification with spaces
printf("[%010s]\n", $s); // zero-padding works on strings too
printf("[%'#10s]\n", $s); // use the custom padding character '#'
printf("[%'#*s]\n", 10, $s); // Provide the padding width as an additional argument
printf("[%10.9s]\n", $t); // right-justification but with a cutoff of 8 characters
printf("[%-10.9s]\n", $t); // left-justification but with a cutoff of 8 characters
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
[monkey]
[ monkey]
[monkey ]
[0000monkey]
[####monkey]
[####monkey]
[ many monk]
[many monk ]
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>print</function></member>
<member><function>sprintf</function></member>
<member><function>fprintf</function></member>
<member><function>vprintf</function></member>
<member><function>vsprintf</function></member>
<member><function>vfprintf</function></member>
<member><function>sscanf</function></member>
<member><function>fscanf</function></member>
<member><function>number_format</function></member>
<member><function>date</function></member>
<member><function>flush</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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