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mysql_real_escape_string() not safe when SET NAMES is used
use mysql_set_charset() instead.
Note: This is the preferred way to change the charset. Using mysql_query() to execute SET NAMES .. is not recommended.
SET NAMES is usually used to switch the encoding from what is default to what the application needs. This is done in a way that mysql_real_escape_string doesn’t know about this. This means if you switch to some multi byte encoding that allows backslash as 2nd 3rd 4th… byte you run into trouble, because mysql_real_escape_string doesn’t escape correctly. UTF-8 is safe…
Safe way to change encodin ......

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if(ereg("^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$",$ip)) {
echo $ip;
} else {
echo "unknown";
}
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<?php
// Á¬½Ó£¬Ñ¡ÔñÊý¾Ý¿â
$dbconn = pg_connect("host=localhost dbname=publishing user=www password=foo")
    or die('Could not connect: ' . pg_last_error());
// Ö´ÐÐ SQL ²éѯ
$query = 'SELECT * from authors';
$result = pg_query($query) or die('Query failed: ' . pg_last_error());
// Óà HTML ÏÔʾ½á¹û
echo "<table>\n";
while ($line = pg_fetch_array($result, null, PGSQL_ASSOC)) {
    echo "\t<tr>\n";
    foreach ($line as $col_value) {
        echo "\t\t<td>$col_value</td>\n";
    }
    echo "\t</tr>\n";
}
echo "</table>\n";
// ÊͷŽá¹û¼¯
pg_free_result($result);
// ¹Ø±ÕÁ¬½Ó
pg_close($dbconn);
?>
http://php.chinaunix.net/manual/zh/ref.pgsql.php
ps:Ò³ÃæÉêÃ÷±àÂ룺ÔÚHTML´úÂëHEADÀïÃæ£¬¿ÉÒÔÓÃ<meta http-equiv="Content-Type" content="text/html;
charset="XXX" />À´¸æËßä¯ÀÀÆ÷ÍøÒ³²ÉÓÃÁËʲô±àÂ룬ĿǰÖÐÎÄÍøÕ¾¿ª·¢ÖÐÖ÷ÒªÓà ......

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<style>
@page
 {mso-page-border-surround-header:no;
 mso-page-border-surround-footer:no;}
@page Section1
 {size:841.9pt 595.3pt;//Ö½ÕŵĴóС
 mso-page-orientation:landscape;
 margin:89.85pt 72.0pt 89.85pt 72.0pt;
 mso-header-margin:42.55pt;//ҳü
 mso-footer-margin:49.6pt;//Ò³½Å
 mso-paper-source:0;
 layout-grid:15.6pt;}
div.Section1
 {page:Section1;}
</style>
ʹÓÃ<div class="Section1"></div>¼´¿ÉʵÏÖ
2¡¢×Ô¶¨ÒåÖ½ÕÅ´óС×Ý´ò
@page
 {mso-page-border-surround-header:no;
 mso-page-border-surround-footer:no;}
@page Section1
 {size: 21.5cm 14.00cm;
 margin-left:0.5cm;//×óÒ³±ß¾à
 margin-right:0.5cm;//ÓÒÒ³±ß¾à
 margin-top:0.5cm;//ÉÏÒ³±ß¾à
 margin-bottom:0.5cm//ÏÂÒ³±ß¾à;
 mso-header-margin:0.5cm;
 mso-footer-margin:0.5cm;
 layout-grid:0.5pt;}
d ......
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