generate unique id by 11 digi number: generate unique id

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generate unique id by 11 digi number #generate unique id

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by Mohamed Riyas - 3 days ago (2018-02-08)

generate unique id

0	I need to generate 11 digit unique id, need need duplicate. how can i generate?

2 Clarification requests

2. by zinsou A.A.E.Moïse - 3 days ago (2018-02-08) Reply

with the first function you got 99999999999 unique ids and 1/99999999999 chance for each id to appear.I don't know anything about a viable way to achieve the goal of getting unique ids with only digit except if you use auto increment with left padding like in function 2 to always get the same length for your ids while keeping uniqueness...

<?php function uniq_digit_id($max=11){//more max is low less you got uniqueness

$i=0;
$uniq_digit_id='';
while($i<$max){
	$uniq_digit_id .=rand(0,9);
	$i++;
}

return $uniq_digit_id;

}

function uniq_digit_id2($max=11,$data='uniq_digit_id2.txt'){


$i=0;
$maxnumber='';
while($i<$max){
	$maxnumber .='9';
	$i++;
}
if(file_exists($data)){
	$id=trim(file_get_contents($data));
	if(strlen($id)==$max){
		/*you must use only one file per counter otherwise the file will be formatted 
		to restart counter according to $max arg */
		if($id==$maxnumber) return false;/*if the max number with the length $max 
		is reached the response will always be false; so be sure to test the value before use it*/
	
		$id++;
		file_put_contents($data,($id=str_pad($id,$max,'0',STR_PAD_LEFT)));
		return $id;
	}else{
		$id=0;
		file_put_contents($data,($id=str_pad($id,$max,'0',STR_PAD_LEFT)));
		return $id;
	}
}else{
	$id=0;
	file_put_contents($data,($id=str_pad($id,$max,'0',STR_PAD_LEFT)));
	return $id;
}

}

echo '<pre>'; var_dump(uniq_digit_id(),uniq_digit_id(),uniq_digit_id(),uniq_digit_id(),uniq_digit_id()); var_dump(uniq_digit_id2(),uniq_digit_id2(),uniq_digit_id2(),uniq_digit_id2(),uniq_digit_id2()); echo '</pre>';

1. by zinsou A.A.E.Moïse - 3 days ago (2018-02-08) Reply

<?php function uniq_digit_id($max=11){//more max is low less you got uniqueness

$i=0;
$uniq_digit_id='';
while($i<$max){
	$uniq_digit_id .=rand(0,9);
	$i++;
}

return $uniq_digit_id;

}

function uniq_digit_id2($max=11,$data='uniq_digit_id2.txt'){


$i=0;
$maxnumber='';
while($i<$max){
	$maxnumber .='9';
	$i++;
}
if(file_exists($data)){
	$id=trim(file_get_contents($data));
	if(strlen($id)==$max){
		/*you must use only one file per counter otherwise the file will be formatted 
		to restart counter according to $max arg */
		if($id==$maxnumber) return false;/*if the max number with the length $max 
		is reached the response will always be false; so be sure to test the value before use it*/
	
		$id++;
		file_put_contents($data,($id=str_pad($id,$max,'0',STR_PAD_LEFT)));
		return $id;
	}else{
		$id=0;
		file_put_contents($data,($id=str_pad($id,$max,'0',STR_PAD_LEFT)));
		return $id;
	}
}else{
	$id=0;
	file_put_contents($data,($id=str_pad($id,$max,'0',STR_PAD_LEFT)));
	return $id;
}

}

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