<?php $str = array("hello", "what", "sorry", "Technology"); echo "=============================== hello"; echo "\n\n"; var_dump($str); echo "\n\n=============================== "; echo "=============================== ".print($str[0])."\n"; echo "\n\n123"; print_r($str); // print_r(count(null)); $str = null; echo htmlspecialchars($str, ENT_COMPAT); // 只转换双引号
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