Alphabet string manipulation

[hairulazami]

Heloo,

I am new guest. I need your help, I want to create string value like this:

AA
AB
AC
.
.
AZ

BA
BB
BC
.
.
BZ

CA
CB
CC
.
.
CZ

until ZZ string value

How to create it ?. Please help me. Thank you so much.

Sincerelly,

(Hairul Azami)

[rajug]

See here the simple two loops in php:

$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

for($i = 0; $i < strlen($str); $i++){
	for($j = 0; $j < strlen($str); $j++){
		print $i . ':' . $j . '=>' .$str[$i] . $str[$j] . '<br>';
	}
}

Does this help you?

[hairulazami]

rajug wrote:

See here the simple two loops in php:

$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

for($i = 0; $i < strlen($str); $i++){
	for($j = 0; $j < strlen($str); $j++){
		print $i . ':' . $j . '=>' .$str[$i] . $str[$j] . '<br>';
	}
}

Does this help you?

wow, this is so help me... I thing my problem is so difficult yet. But, after I seen your replay I am so surprise. Thank you so much, It work succesfuly !

Actually I want to build PHP script for this logical:

I want to create User ID with value "A06 00001";

-- The first unit ID is alphabet A, second unit ID is year registered, and the last unit ID is autoincreament database ID.

-- For Every 10.000 user database ID, so the first unit ID must be move to AA, for the example:

A06 00001;
AA06 10000;
AB06 20000;
.
.
and the last for looping back to the first is: AZ06 260000

Very thank you so much! You are very friendly...

[laserlight]

There might be better ways, but here's one way:

<?php
function userId($year, $id) {
    $letters = range('A', 'Z');
    // map $id to 'A' and 'AA' to 'ZZ'
    // There are 6770000 valid user ids.
    // 6770000 = 26 * 26 * 10000 + 10000
    if ($id < 10000) {
        return 'A' . $year . ' ' . $id;
    } else if ($id < 6770000) {
        // $letters array index
        $index = (int)($id / 10000) - 1;
        return $letters[(int)($index / 26)]
            . $letters[$index % 26] . $year . ' ' . $id;
    } else {
        return false; // cannot create valid user id
    }
}

// an example
echo userId('06', '278912');
?>

[hairulazami]

laserlight wrote:

There might be better ways, but here's one way:

function userId($year, $id) {
    $letters = range('A', 'Z');
    // map $id to 'A' and 'AA' to 'ZZ'
    $index = (int)($id / 10000);
    if ($index == 0) {
        return 'A' . $year . ' ' . $id;
    } else if ($id < 6770000) {
        --$index; // to account for array index offset
        return $letters[(int)($index / 26)]
            . $letters[(int)($index % 26)] . $year . ' ' . $id;
    } else {
        return false; // cannot create valid user id
    }
}

Ok Laser Light, I think your replay is the best answer to help me.. 🙂

It worked successfully. Thank you so much 🙂

Bay the way at your profile, you still 21 years old isn'it ? I am so shy to you...For little story, I had try to solve this function, but the result is NULL. I am so sad. I must be hard learn too .. Like You Laser Light ... Thank you so much,

[laserlight]

For little story, I had try to solve this function, but the result is NULL. I am so sad. I must be hard learn too

Solving this problem is basically about mapping:
0-9999 to A
10000-6769999 to AA-ZZ

This revised version of the function I posted may be even easier to understand:

<?php
/* Creates a user id by mapping $id to 'A' and 'AA' to 'ZZ'.
 * There are (26 * 26 * 10000 + 10000) = 6770000 valid user ids.
 * Returns false if arguments supplied lead to an invalid user id.
 */
function userId($year, $id) {
    // check that user id to be created is valid
    if ($id < 6770000) {
        $prefix = 'A'; // prefix for $id < 10000
        // check if two character prefix is needed
        if ($id >= 10000) {
            $letters = range('A', 'Z');
            $index = (int)($id / 10000) - 1;
            $prefix = $letters[(int)($index / 26)] . $letters[$index % 26];
        }
        return $prefix . $year . ' ' . $id;
    } else {
        return false; 
    }
}

// an example
echo userId('06', '278912');
?>

[hairulazami]

Yes, I am understand now. So we must be use mapping concept to di this.

Bellow is my bad function yet:

$patokanTerus4=date("Y"); //misalkan 2006 (4 digit)
	$patokanTerus2=date("y"); //misalkan 06 (2 digit)
	$pp=$patokanTerus4-$patokanTerus2; //jadikan bilangan yg hasilnya 2000
	for($p=1;$p<=$pp;$p++) //looping terus menerus selama 1 - kurang dari sama dengan 2000
	{
		if($barisAlphabet/260000==$p)
		{
			$kurangRibu=260000;
		}
		else
		{
			$kurangRibu=$barisAlphabet;
		}	
	}

$strArray="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	//tingkat 10000(A) - 260000(Z)
	if($barisAlphabet<=$kurangRibu)
	{
		$ribu=10000;

	for($hihi=1;$hihi<=24;$hihi++)
	{
		if($barisAlphabet >= $hihi*$ribu)
		{
			$k=$hihi-1;
			$IDa[$k]=$strArray{$k};
			$IDa[$hihi]=$strArray{$hihi};
			$IDa="$IDa[$k]$ID[$hihi]";
		}
		elseif($barisAlphabet < $ribu)
		{
			$IDa=$strArray{0};				
		}
		else
		{
			$IDa=$strArray{25};				
		}		
	}	
}
else
{
	$IDa=$strArray{0};
}