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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$waf_patterns = [
'/[A-Za-z0-9]+/i',
'/system|exec|passthru|shell_exec|assert|eval|base64_decode|gzuncompress|c
all_user_func|call_user_func_array|`/i',
'/\./',
'/chr\s*\(/i',
'/\^/',
'/\+\+/',
'/\\\\x[0-9a-f]{2}/i',
'/%[0-9a-f]{2}/i',
];
$allVisibleChars = range(32, 126);
$notFilteredChars = [];
foreach ($allVisibleChars as $charCode) {
$char = chr($charCode);
$matched = false;
foreach ($waf_patterns as $pattern) {
if (preg_match($pattern, $char)) {
$matched = true;
break;
}
}
if (!$matched) {
$notFilteredChars[] = $char;
}
}
if (empty($notFilteredChars)) {
echo "所有字符都被正则表达式过滤了。\n";
} else {
echo "以下字符没有被正则表达式过滤：\n";
foreach ($notFilteredChars as $char) {
echo $char . " ";
}
echo "\n";
}