Error - Parse error: syntax error, Unexpected '[' in

Question

There’s a syntax error on line 13, you could help me decipher, I’m not finding.

OBS: in localhost it works, but in server web displays the error.

<!--Início Scritp PHP-->
<?php
    session_start();
    include_once 'conexao.php';
    $nome     = filter_input (INPUT_POST, 'nome', FILTER_SANITIZE_SPECIAL_CHARS);
    $empresa  = filter_input (INPUT_POST, 'empresa', FILTER_SANITIZE_SPECIAL_CHARS);
    $telefone = filter_input (INPUT_POST, 'telefone', FILTER_SANITIZE_NUMBER_INT);
    $email    = filter_input (INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
    $endereco = filter_input (INPUT_POST, 'endereco', FILTER_SANITIZE_SPECIAL_CHARS);
    $cnpj     = filter_input (INPUT_POST, 'cnpj', FILTER_SANITIZE_SPECIAL_CHARS);
    $obs      = filter_input (INPUT_POST, 'obs', FILTER_SANITIZE_SPECIAL_CHARS);
    $querySelect = $link->query("select email from tb_clientes");
    $array_emails = []; **<- esta linha**
    while($emails = $querySelect->fetch_assoc()):
        $emails_existentes = $emails['email'];
        array_push($array_emails,$emails_existentes);
    endwhile;
    if(in_array($email,$array_emails)):
        $_SESSION['msg'] = "<p class='center red-text'>".'Já existe um cliente cadastrado com esse E-mail!'."</p>";
        header("Location: cadastro.php");
        else:
        $queryInsert = $link->query("insert into tb_clientes values (default,'$nome','$empresa','$telefone','$email','$endereco','$cnpj','$obs')");
        $affected_rows = mysqli_affected_rows($link);
        if($affected_rows > 0):
            $_SESSION['msg'] = "<p class='center green-text'>".'Cadastro efetuado com sucesso!'."</p>";
            header("Location: cadastro.php");
        endif;
    endif;
?>
<!--Fim Scritp PHP-->

Answer 1

From what I understand, you are trying to create an empty array.

[] was added from php 5.4. Take a look at this documentation.

https://www.php.net/manual/en/language.types.array.php

Another alternative is to create this empty array this way.

$array = array();