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How to create random alphanumeric in PHP?

// online code for creating alphanumeric in php 
// this will generate 6 charactor, you can create as many just change the 6 from code
$pass = substr(str_shuffle("0123456789abcdefghijklmnopqrstvwxyz"), 0, 6);
echo $pass;

//output : 17w2y8
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