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;
}