PHP's Accidental Hash Collision Feature

bugs Hashing Language design Programming quirks Security vulnerabilities Type juggling Md5 Loose comparison

php Programming Debugging Security

6 months ago 223,873 views 0 shares

PHP's Accidental Hash Collision Feature

php-memes, security-memes, type-juggling-memes, md5-memes, hashing-memes | ProgrammerHumor.io

Behold, PHP's infamous type juggling strikes again! The meme shows how md5('240610708') == md5('QNKCDZO') evaluates to true despite being completely different strings.

What's happening? Both MD5 hashes begin with '0e' followed by digits, which PHP helpfully interprets as scientific notation (0×10^something). And since 0 raised to any power equals 0, PHP thinks both hashes equal zero. It's basically comparing 0==0.

This is why strict comparison (===) exists in PHP. Without it, you might accidentally authenticate someone with the wrong password! Security nightmare fuel for any developer who values their sanity.

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