imagefontheight.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.imagefontheight" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>imagefontheight</refname>
  <refpurpose>获取字体高度</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>imagefontheight</methodname>
   <methodparam><type class="union"><type>GdFont</type><type>int</type></type><parameter>font</parameter></methodparam>
  </methodsynopsis>
  <para>
   返回指定字体中字符的像素高度。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &gd.font.description;
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回字体的像素高度。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      &gd.changelog.gdfont-instance;
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>在内置字体上使用 <function>imagefontheight</function></title>
    <programlisting role="php">
<![CDATA[
<?php
echo 'Font height: ' . imagefontheight(4);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Font height: 16
]]>
    </screen>
   </example>
   <example>
    <title>将 <function>imagefontheight</function> 与 <function>imageloadfont</function> 一起使用</title>
    <programlisting role="php">
<![CDATA[
<?php
// Load a .gdf font
$font = imageloadfont('anonymous.gdf');

echo 'Font height: ' . imagefontheight($font);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Font height: 43
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>imagefontwidth</function></member>
   <member><function>imageloadfont</function></member>
  </simplelist>
 </refsect1>
</refentry>

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