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Undefined function sha256()

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I have this php code: $password = sha256($_POST['password']); but when I run this code it says: Fatal error: Call to undefined function sha256() in .... on line ...ix it as What is wrong with this code and what must I do to fix this as I know that sha256 exists. I have also tried: $password = sha256(trim($_POST['password'])); But that doesn't work either. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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You can use hash( 'sha256', $string ); See http://de.php.net/manual/de/function.hash.php

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