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A line in PHP that doesn't make sense

I experimented with PHP's weak / dynamic typing properties in preparation for the test and was completely puzzled by the output of this string concatenation. Can someone please explain how this is possible?

<?php echo  1 . "/n" . '1' + 1 ?><br />

output:

2

+3


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1 answer


Analysis:

echo  1 . "/n" . '1' + 1;

equivalent to

//joined first 3 items as string
echo "1/n1"+1;


equivalent to

//php faces '+' operator, it parses '1/n1' as number
//it stops parsing at '/n' because a number doesn't
//contain this character
echo "1"+1;

equivalent to

echo 1+1;
+2


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