Random String - PHP

function randomstring( $s )
{
$r = array( );
foreach ( $s as $t )
{
for ( $i = 0; $i < $t[ "count" ]; $i++ )
{
$r[ ] = $t[ "char" ][ rand( 0, strlen( $t[ "char" ] ) - 1 ) ];
}
}
shuffle( $r );
return implode( "", $r );
}

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