imagecreatefromstring.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.imagecreatefromstring" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>imagecreatefromstring</refname>
  <refpurpose>从字符串的图像流中新建图像</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>GdImage</type><type>false</type></type><methodname>imagecreatefromstring</methodname>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>imagecreatefromstring</function> 返回图像标识符，代表从指定 <parameter>data</parameter>
   获得的图像。图像格式将自动检测，只要编译的 PHP 支持：JPEG、PNG、GIF、BMP、WBMP、GD2、 WEBP 和 AVIF。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
       包含图像数据的字符串。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   成功时返回图像对象。如果图像类型不支持、数据格式不可识别或者图像已损坏且无法加载，则返回 &false;。
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   如果数据格式不可识别，则 <function>imagecreatefromstring</function> 引发 E_WARNING 级别错误。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       成功时，此函数现在返回 <classname>GDImage</classname> 实例；之前返回 <type>resource</type>。
      </entry>
     </row>
     <row>
      <entry>7.3.0</entry>
      <entry>
       现在支持 WEBP（如果使用的是 libgd）。
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>imagecreatefromstring</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$data = 'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABl'
       . 'BMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDr'
       . 'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r'
       . '8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg==';
$data = base64_decode($data);

$im = imagecreatefromstring($data);
if ($im !== false) {
    header('Content-Type: image/png');
    imagepng($im);
    imagedestroy($im);
}
else {
    echo 'An error occurred.';
}
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <mediaobject>
     <alt>示例输出：imagecreatefromstring()</alt>
     <imageobject>
      <imagedata fileref="en/reference/image/figures/imagecreatefromstring.png"/>
     </imageobject>
    </mediaobject>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>imagecreatefromjpeg</function></member>
   <member><function>imagecreatefrompng</function></member>
   <member><function>imagecreatefromgif</function></member>
   <member><function>imagecreatetruecolor</function></member>
  </simplelist>
 </refsect1>
</refentry>
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