reference/var/functions/print-r.xml
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>mixed</type><methodname>print_r</methodname>
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<methodparam><type>mixed</type><parameter>expression</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>return</parameter><initializer>false</initializer></methodparam>
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<type class="union"><type>string</type><type>true</type></type><methodname>print_r</methodname>
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<methodparam><type>mixed</type><parameter>value</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>return</parameter><initializer>&false;</initializer></methodparam>
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</methodsynopsis>
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<para>
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<function>print_r</function> displays information about a variable
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<para>
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<function>print_r</function>, <function>var_dump</function> and
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<function>var_export</function> will
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also show protected and private properties of objects with PHP 5.
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also show protected and private properties of objects.
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Static class members will not be shown.
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</para>
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<para>
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Remember that <function>print_r</function> will move the array
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pointer to the end. Use <function>reset</function> to bring
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it back to beginning.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>expression</parameter></term>
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<term><parameter>value</parameter></term>
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<listitem>
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<para>
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The expression to be printed.
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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If given a <type>string</type>, <type>integer</type> or <type>float</type>,
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If given a <type>string</type>, <type>int</type> or <type>float</type>,
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the value itself will be printed. If given an <type>array</type>, values
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will be presented in a format that shows keys and elements. Similar
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notation is used for <type>object</type>s.
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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&note.uses-ob;
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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</thead>
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<tbody>
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<row>
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<entry>4.3.0</entry>
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<entry>
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The <parameter>return</parameter> parameter was added. If you need to
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capture the output of <function>print_r</function> with an older
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version of PHP prior, use the
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<link linkend="ref.outcontrol">output-control functions</link>.
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</entry>
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</row>
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<row>
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<entry>4.0.4</entry>
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<entry>8.4.0</entry>
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<entry>
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Prior to PHP 4.0.4, <function>print_r</function> will continue forever
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if given an <type>array</type> or <type>object</type> that
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contains a direct or indirect reference to itself. An example
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is <literal>print_r($GLOBALS)</literal> because
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<literal>$GLOBALS</literal> is itself a global variable that
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contains a reference to itself.
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Return type changed from <type class="union"><type>string</type><type>bool</type></type> to <type class="union"><type>string</type><type>true</type></type>.
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</entry>
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</row>
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</tbody>
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<pre>
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<?php
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$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z'));
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print_r ($a);
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print_r($a);
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?>
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</pre>
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]]>
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<?php
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$b = array ('m' => 'monkey', 'foo' => 'bar', 'x' => array ('x', 'y', 'z'));
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$results = print_r($b, true); // $results now contains output from print_r
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print_r($results);
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?>
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]]>
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</programlisting>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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&note.uses-ob-php70;
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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Translation status