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>imagecreatefrompng</H1
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><P
> (PHP 3 >= 3.0.13, PHP 4, PHP 5)</P
>imagecreatefrompng -- Cria uma nova imagem a apratir de um arquivo ou URL</DIV
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>Descrição</H2
>resource <B
CLASS="methodname"
>imagecreatefrompng</B
> ( string filename )<BR
></BR
><P
> <B
CLASS="function"
>imagecreatefrompng()</B
> retorna um identificador de imagem
representando a imagem obtida através do nome de arquivo dado.
</P
><P
> <B
CLASS="function"
>imagecreatefrompng()</B
> retorna uma string vazia
em caso de falha. Também mostra uma mensagem de erro, a qual infelizmente
aparece como um link quebrado no browser. Para facilitar o debug, o
exemplo asseguir irá prodizir um <ACRONYM
CLASS="acronym"
>PNG</ACRONYM
> de erro:
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>Exemplo 1.
Exemplo de como manipular um erro durante a criação (cortesia de
vic at zymsys dot com)
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><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#007700">function </font><font color="#0000BB">LoadPNG</font><font color="#007700">(</font><font color="#0000BB">$imgname</font><font color="#007700">) <br />{<br /> </font><font color="#0000BB">$im </font><font color="#007700">= @</font><font color="#0000BB">imagecreatefrompng</font><font color="#007700">(</font><font color="#0000BB">$imgname</font><font color="#007700">); </font><font color="#FF8000">/* Attempt to open */<br /> </font><font color="#007700">if (!</font><font color="#0000BB">$im</font><font color="#007700">) { </font><font color="#FF8000">/* See if it failed */<br /> </font><font color="#0000BB">$im </font><font color="#007700">= </font><font color="#0000BB">imagecreate</font><font color="#007700">(</font><font color="#0000BB">150</font><font color="#007700">, </font><font color="#0000BB">30</font><font color="#007700">); </font><font color="#FF8000">/* Create a blank image */<br /> </font><font color="#0000BB">$bgc </font><font color="#007700">= </font><font color="#0000BB">imagecolorallocate</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">255</font><font color="#007700">, </font><font color="#0000BB">255</font><font color="#007700">, </font><font color="#0000BB">255</font><font color="#007700">);<br /> </font><font color="#0000BB">$tc </font><font color="#007700">= </font><font color="#0000BB">imagecolorallocate</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">);<br /> </font><font color="#0000BB">imagefilledrectangle</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">150</font><font color="#007700">, </font><font color="#0000BB">30</font><font color="#007700">, </font><font color="#0000BB">$bgc</font><font color="#007700">);<br /> </font><font color="#FF8000">/* Output an errmsg */<br /> </font><font color="#0000BB">imagestring</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#0000BB">5</font><font color="#007700">, </font><font color="#0000BB">5</font><font color="#007700">, </font><font color="#DD0000">"Error loading $imgname"</font><font color="#007700">, </font><font color="#0000BB">$tc</font><font color="#007700">);<br /> }<br /> return </font><font color="#0000BB">$im</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?></font>
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><B
>Dica: </B
>Você pode usar uma URL com esta
função se <A
HREF="ref.filesystem.html#ini.allow-url-fopen"
> fopen wrappers</A
> estiver habilitado.
Veja <A
HREF="function.fopen.html"
><B
CLASS="function"
>fopen()</B
></A
> para mais detalhes em como especificar
o nome do arquivo e <A
HREF="wrappers.html"
>Apêndice N</A
> para uma lista de protocolos
URL suportados.</P
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>A versões Windows do PHP
anteriores ao PHP 4.3.0 não suportam acesso a arquivos remotos através desta função, mesmo se
<A
HREF="ref.filesystem.html#ini.allow-url-fopen"
>allow_url_fopen</A
> estiver ativado.
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