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PHP のフィルタ型 FILTER_SANITIZE_STRING、FILTER_SANITIZE_SPECIAL_CHARS、FILTER_SANITIZE_FULL_SPECIAL_CHARS の違い - Qiita
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PHP Filters to Sanitize and Validate Data: Examples (Updated) – PHP Programming Blog | CodeFixUp.com
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Denis on Twitter: "Malicious code that creates a rogue WordPress admin "zuserisasisu" uses strrev function to obfuscate tell-tale strings like rotartsinimda-administrator, resu_tresni_pw - wp_insert_user, php.daol-pw/ - /wp-load.php. https://t.co ...
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