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$str = 'i love u';
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$str = "i love $test";
$str1 = 'i love $test';
echo $str; //½«µÃµ½ i love iwind
echo $str1; //½«µÃµ½ i love $test
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echo 'i love \test'; // ½«µÃµ½ i love \test
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echo $return; // Êä³ö1
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isset($str) or echo "str ±äÁ¿Î´¶¨Òå";// ½«Ìáʾ·ÖÎö´íÎó
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print "i ","love ","iwind"; // ½«Ìáʾ´íÎó
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