Description:
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I've recently noticed a strange behavior of php comparison on float/double and string, i searched online but found nothing related, I'm not sure if it's a real bug or not, so I've posted it here. I understand there might be some type conversion problem, but i don't quite understand what's really going on.

I understand the problem is about float number, but I'm not using === to compare, and the output(var_dump) of two value is same, so I expect same results here.
As a note, not every case result wrong, some case is working.

Test script:
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code is running in Psy Shell v0.8.2, but the issue can be reproduced anywhere.

>>> $a=986365.1;$b='986365.1';var_dump($a,$b,$a==$b);
float(986365.1)
string(8) "986365.1"
bool(true)

>>> $a='73.01'*13510;$b='986365.1';var_dump($a,$b,$a==$b);
float(986365.1)
string(8) "986365.1"
bool(false)

>>> $a='5.01'*10.1;$b='50.601';var_dump($a,$b,$a==$b);
float(50.601)
string(6) "50.601"
bool(true)

Expected result:
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i expect same result bool(true) in all test scripts.