Is this php behaviour explained somewhere in manual? (strings with zeroes comparison)

Question

Why for php

\'00\' == \'0000\'

expression is true?

Is it explained somewhere in manual?

NOTE:

Answer 1

Just read:

If [...] the comparison involves numerical strings, then each string is converted to a number and the comparison performed numerically

I removed the part that probably was standing in your way.

Answer 2

It's also good to remember that

If you compare a number with a string or the comparison involves numerical strings, then each string is converted to a number and the comparison performed numerically. These rules also apply to the switch statement. The type conversion does not take place when the comparison is === or !== as this involves comparing the type as well as the value. enter link description here

But everything everyone else has said is correct!

Answer 3

"If you compare a number with a string or the comparison involves numerical strings, then each string is converted to a number and the comparison performed numerically." (PHP manual)

Answer 4

Because when you compare this strings they become zeros on both sides so 0 == 0 is true, try to use '00' === '0000' here is link

Answer 5

Sure

== compares values and neglects type
=== compares values and types

here is it:

http://php.net/manual/en/language.operators.comparison.php

*UPDATE:

Read this part in this URL :

http://php.net/manual/en/function.intval.php

Strings will most likely return 0 although this depends on the leftmost characters of the string. The common rules of integer casting apply.