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<?php 
function generarCodigo($longitud) { 
 $key = ''; 
 $pattern = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ'; //Elegimos los caracteres que se usaran
 $max = strlen($pattern)-1; 
 for($i=0;$i < $longitud;$i++) $key .= $pattern{mt_rand(0,$max)}; //La magia 
 return $key; 
} 
 
//Ejemplo de uso 
 
echo generarCodigo(4);//Donde el 4 es el numero de caracteres que se ejecutaran 
echo "-"; 
echo generarCodigo(4); 
echo "-"; 
echo generarCodigo(4); 
echo "-"; 
echo generarCodigo(4); 
?> 

Main.java:1: error: class, interface, or enum expected
<?php 
^
Main.java:1: error: class, interface, or enum expected
<?php 
 ^
Main.java:1: error: class, interface, or enum expected
<?php 
  ^
Main.java:3: error: empty character literal
 $key = ''; 
        ^
Main.java:3: error: unclosed character literal
 $key = ''; 
         ^
Main.java:4: error: unclosed character literal
 $pattern = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ'; //Elegimos los caracteres que se usaran
            ^
Main.java:4: error: unclosed character literal
 $pattern = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ'; //Elegimos los caracteres que se usaran
                                                 ^
Main.java:6: error: class, interface, or enum expected
 for($i=0;$i < $longitud;$i++) $key .= $pattern{mt_rand(0,$max)}; //La magia 
 ^
Main.java:6: error: class, interface, or enum expected
 for($i=0;$i < $longitud;$i++) $key .= $pattern{mt_rand(0,$max)}; //La magia 
          ^
Main.java:6: error: class, interface, or enum expected
 for($i=0;$i < $longitud;$i++) $key .= $pattern{mt_rand(0,$max)}; //La magia 
                         ^
Main.java:7: error: class, interface, or enum expected
 return $key; 
 ^
Main.java:8: error: class, interface, or enum expected
} 
^
Main.java:13: error: class, interface, or enum expected
echo "-"; 
^
Main.java:14: error: class, interface, or enum expected
echo generarCodigo(4); 
^
Main.java:15: error: class, interface, or enum expected
echo "-"; 
^
Main.java:16: error: class, interface, or enum expected
echo generarCodigo(4); 
^
Main.java:17: error: class, interface, or enum expected
echo "-"; 
^
Main.java:18: error: class, interface, or enum expected
echo generarCodigo(4); 
^
Main.java:19: error: class, interface, or enum expected
?> 
^
19 errors

Standard output is empty