Latitude Longitude Regular Expression Validation PHP

latlong.php

<?php

/**
 * Validates a given latitude $lat
 *
 * @param float|int|string $lat Latitude
 * @return bool `true` if $lat is valid, `false` if not
 */
function validateLatitude($lat) {
  return preg_match('/^(\+|-)?(?:90(?:(?:\.0{1,6})?)|(?:[0-9]|[1-8][0-9])(?:(?:\.[0-9]{1,6})?))$/', $lat);
}

/**
 * Validates a given longitude $long
 *
 * @param float|int|string $long Longitude
 * @return bool `true` if $long is valid, `false` if not
 */
function validateLongitude($long) {
  return preg_match('/^(\+|-)?(?:180(?:(?:\.0{1,6})?)|(?:[0-9]|[1-9][0-9]|1[0-7][0-9])(?:(?:\.[0-9]{1,6})?))$/', $long);
}

/**
 * Validates a given coordinate
 *
 * @param float|int|string $lat Latitude
 * @param float|int|string $long Longitude
 * @return bool `true` if the coordinate is valid, `false` if not
 */
function validateLatLong($lat, $long) {
  return preg_match('/^[-]?(([0-8]?[0-9])\.(\d+))|(90(\.0+)?),[-]?((((1[0-7][0-9])|([0-9]?[0-9]))\.(\d+))|180(\.0+)?)$/', $lat.','.$long);
}


$tests = [
  'lat' => [
    '0.0','+90.0','-90.0','90.0','+45','-45','45','50','55.55','45,1','A',],
  'long' => [
    '0.0', '180', '-180', '+180', '179.9', 'A',
  ],
  'lat_long' => [
    '90.0,180.0',
    '47.1,179.1',
    '90.1a,180.1a'
  ]
];

echo "\033[37;44m:::::::::::: Tests ::::::::::::\033[0m".PHP_EOL;
echo "\033[1mType:\t\tValue:\tResult\033[0m".PHP_EOL;

foreach ($tests['lat'] as $lat) {
  echo "Latitude:\t$lat\t\t".((validateLatitude($lat)) ? "\033[32mMATCH\033[0m" : "\033[31mFAIL\033[0m").PHP_EOL;
}

foreach ($tests['long'] as $long) {
  echo "Longitude:\t$long\t\t".((validateLongitude($long)) ? "\033[32mMATCH\033[0m" : "\033[31mFAIL\033[0m").PHP_EOL;
}

foreach ($tests['lat_long'] as $lat_long) {
  $geo = explode(",", $lat_long);
  echo "Lat,Long:\t$lat_long\t".((validateLatLong($geo[0],$geo[1])) ? "\033[32mMATCH\033[0m" : "\033[31mFAIL\033[0m").PHP_EOL;
}

  /**
 * Validates a given coordinate
 *
 * @param float|int|string $lat Latitude
 * @param float|int|string $long Longitude
 * @return bool `true` if the coordinate is valid, `false` if not
 */
function is_coordinate($lat, $long) {

    $lat_pattern  = '/\A[+-]?(?:90(?:\.0{1,18})?|\d(?(?<=9)|\d?)\.\d{1,18})\z/x';
    $long_pattern = '/\A[+-]?(?:180(?:\.0{1,18})?|(?:1[0-7]\d|\d{1,2})\.\d{1,18})\z/x';

    if (preg_match($lat_pattern, $lat) && preg_match($long_pattern, $long)) {
        return true;
    } else {
        return false;
    }
}


/* These are two points in Turkey */
$point1 = array('lat' => 41.008610, 'long' => 28.971111); // Istanbul
$point2 = array('lat' => 39.925018, 'long' => 32.836956); // Anitkabir

echo '<br>';

if(!is_coordinate($point1['lat'], $point1['long'])){
    echo 'Invalid coordinate.';
} else {
    echo 'The current coordinate.';
}

echo '<br>';

if(!is_coordinate($point2['lat'], $point2['long'])){
    echo 'Invalid coordinate.';
} else {
    echo 'The current coordinate.';
}

---

1. https://github.com/aliyilmaz/Mind/blob/master/src/Mind.php#L1449
2. https://github.com/aliyilmaz/Mind/blob/master/tests/is_coordinate.php
3. https://github.com/aliyilmaz/Mind/blob/master/tests/validate.php

I don't think this we work for wgs84 projection? like 384943.343,344343.004 if yes please suggest anyone perfect. thanks

I use this regex and it works correct:

latitude:

'regex:/^[-]?(([0-8]?[0-9])\.(\d+))|(90(\.0+)?)$/'

longitude:

'regex:/^[-]?((((1[0-7][0-9])|([0-9]?[0-9]))\.(\d+))|180(\.0+)?)$/'

Northings and eastings from Nigeria can use this 'regex:/^\d{1,6}(.\d{1,3})?$/'

I use this regex and it works correct:

latitude:

'regex:/^[-]?(([0-8]?[0-9])\.(\d+))|(90(\.0+)?)$/'

longitude:

'regex:/^[-]?((((1[0-7][0-9])|([0-9]?[0-9]))\.(\d+))|180(\.0+)?)$/'

i will try this on lat an long thanks

echo preg_match('/^[-]?(([0-8]?[0-9]).(\d+))|(90(.0+)?),[-]?((((1[0-7][0-9])|([0-9]?[0-9])).(\d+))|180(.0+)?)$/', '41.883551-82.702518');

I removed the comma and it still returns 1, is there a way to have it so it fails if no comma?

echo preg_match('/^[-]?(([0-8]?[0-9]).(\d+))|(90(.0+)?),[-]?((((1[0-7][0-9])|([0-9]?[0-9])).(\d+))|180(.0+)?)$/', '41.883551-82.702518');

I removed the comma and it still returns 1, is there a way to have it so it fails if no comma?

Maybe you should try and elaborate on what the problem is .

but it is not valid in the case of "--",
I used this regex but it accepted"--78798989898" case which is wrong, Can anyone suggest me something?

but it is not valid in the case of "--", I used this regex but it accepted"--78798989898" case which is wrong, Can anyone suggest me something?

can you tell me the format of the result you want to obtain?