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A better way to implement this function is:

function RandomString($length) {
 $keys = array_merge(range(0,9), range('a', 'z'));
 $key = "";
 for($i=0; $i < $length; $i++) {
 $key .= $keys[mt_rand(0, count($keys) - 1)];
 }
 return $key;
}
echo RandomString(20);

mt_rand is more random according to this and this in php7. rand function is an alias of mt_rand.

A better way to implement this function is:

function RandomString($length) {
 $keys = array_merge(range(0,9), range('a', 'z'));
 $key = "";
 for($i=0; $i < $length; $i++) {
 $key .= $keys[mt_rand(0, count($keys) - 1)];
 }
 return $key;
}
echo RandomString(20);

mt_rand is more random according to this and this in PHP 7. The rand function is an alias of mt_rand.

A better way to implement this function is:

function RandomString($length) {
 $keys = array_merge(range(0,9), range('a', 'z'));
 $key = "";
 for($i=0; $i < $length; $i++) {
 $key .= $keys[mt_rand(0, count($keys) - 1)];
 }
 return $key;
}
echo RandomString(20);

mt_rand is more random according to this and this in php7 rand function is an alias of mt_rand.

A better way to implement this function is:

function RandomString($length) {
 $keys = array_merge(range(0,9), range('a', 'z'));
 $key = "";
 for($i=0; $i < $length; $i++) {
 $key .= $keys[mt_rand(0, count($keys) - 1)];
 }
 return $key;
}
echo RandomString(20);

mt_rand is more random according to this and this in php7. rand function is an alias of mt_rand.

A better way to implement this function is:

function RandomString($length) {
 $keys = array_merge(range(0,9), range('a', 'z'));
 $key = "";
 for($i=0; $i < $length; $i++) {
 $key .= $keys[mt_rand(0, count($keys) - 1)];
 }
 return $key;
}
echo RandomString(20);

mt_rand is more random according to this and this

A better way to implement this function is:

function RandomString($length) {
 $keys = array_merge(range(0,9), range('a', 'z'));
 $key = "";
 for($i=0; $i < $length; $i++) {
 $key .= $keys[mt_rand(0, count($keys) - 1)];
 }
 return $key;
}
echo RandomString(20);

mt_rand is more random according to this and this in php7 rand function is an alias of mt_rand.