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if ($score >= 60) {
    echo '¼°¸ñÁË';
} else {
    echo 'ûÓм°¸ñ';
}

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is_null()º¯Êý£ºÅжÏÒ»¸ö±äÁ¿ÊÇ·ñΪnull¡£

if (is_null($variable)) {
    echo '¸Ã±äÁ¿Îªnull';
} else {
    echo '¸Ã±äÁ¿²»ÊÇnull';
}

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empty()º¯Êý£ºÅжÏÒ»¸ö±äÁ¿ÊÇ·ñΪ¿Õ¡£

if (empty($variable)) {
    echo '¸Ã±äÁ¿Îª¿Õ';
} else {
    echo '¸Ã±äÁ¿²»Îª¿Õ';
}

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isset()º¯Êý£ºÅжÏÒ»¸ö±äÁ¿ÊÇ·ñÒÑÉùÃ÷²¢ÇÒÖµ²»Îªnull¡£

if (isset($variable)) {
    echo '¸Ã±äÁ¿ÒÑÉùÃ÷²¢ÇÒÖµ²»Îªnull';
} else {
    echo '¸Ã±äÁ¿Î´ÉùÃ÷»òÕßֵΪnull';
}

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