Behavior of the function preg_match() for short names

Question

I set up a function that takes a full name with X names and surnames and returns only the first and last names. If you have a connective (from, from, from, dos, etc.) before the last surname, it attaches in the result.

But the function preg_match(), is returning the opposite expected by my regex.

Example:

function abrevia($var) {
$nomes = explode(" ", $var);
$a = reset($nomes);
$c = end($nomes);
if (count($nomes) > 2) {
    $b = prev($nomes);
    if (preg_match('/^[^A-Z]*$/', $b{0})) {
        return implode(" ", array($a, $b, $c));
    }
}
return implode(" ", array($a, $c));
}

$a[1] = "João Testador dos Testes";
$a[2] = "João dos Testis Testando do Teste";
$a[3] = "João do Teste";

$b = array_map('abrevia', $a);

var_dump($b);

Returns:

array (size=3)
1 => string 'João dos Testes' (length=16)
2 => string 'João do Teste' (length=14)
3 => string 'João do Teste' (length=14)

Doubt:

This function below should not return false(0)?

$b = "da";
var_dump(preg_match('/^[^A-Z]*$/', $b{0})); //retorna 1

Answer 1

Your question has been answered, but you are predicting that the data will always come formatted as you want, ie names and surnames with the first uppercase and connective in lowercase...

thus reducing the possibility of errors:

<?php
    function abrevia($var) {
    $nomes = explode(" ", $var);
    $a = reset($nomes);
    $c = end($nomes);
    if (count($nomes) > 2) {
        $b = prev($nomes);
        if (preg_match('/^[deaos]{2,3}$/i', $b)) {
            return implode(" ", array($a, $b, $c));
        }
    }
    return implode(" ", array($a, $c));
    }

    $a[] = "João Testador dos Testes";
    $a[] = "joão dos testis testando teste";
    $a[] = "João do Teste";
    $a[] = "João Testador Das Dores";
    $a[] = "João Testador de Melo";
    $a[] = "João Testador Da Silva";

    $b = array_map('abrevia', $a);

    var_dump($b);
?>

returns:

array(6) {
  [0]=>
  string(15) "João dos Testes"
  [1]=>
  string(10) "joão teste"
  [2]=>
  string(13) "João do Teste"
  [3]=>
  string(14) "João Das Dores"
  [4]=>
  string(12) "João de Melo"
  [5]=>
  string(13) "João Da Silva"
}

Answer 2

$b = "da";
var_dump(preg_match('/^[^A-Z]*$/', $b{0}));

Your regex says, match at line start(^) something other than capital letters between A-Z([^A-Z]) followed by any character(*), when it’s past $b[0] preg_match() applies regex only on d already you are passing the string Dice, the return is 1 why the combination happened.

Answer 3

Try this.

/**
 * Abreviar Nome
 * @param String $string Name user
 * @return string
 */
function FirstAndLastName($string) {
    $nome = explode(" ", $string);
    $first = $nome[0];
    $last = end($nome);
    if (count($nome) == 1) {
        $result = $nome[0];
    } else {
        $result = $first . ' ' . $last;
    }

    return $result;
}

Answer 4

do so

 $nome = 'JOAO DOS TESTES';
 $retira = array(' DE ', ' DOS ', ' E ', ' DO ', ' DA ', ' DAS ', ' DI ');
 $nomeLimpo = str_replace($retira, ' ', $nome);