PHP-从类中回显数组值

Question

I have the following PHP code

<?php
class SimpleEmailServiceMessage
{
    public function properNames($formValue) {
    $formValue = strtolower($formValue); //Make all letters small case
    $formValue = ucwords($formValue); //Make all first letters capital
    $formValue = str_replace('','',$formValue); //Remove extra spaces

    if(is_numeric($username)) {
      $error[] = 'The name is invalid';
    }
    return $error;
    return $formValue;
    }
}

$username = 'john doe';

$m = new SimpleEmailServiceMessage();
echo $m->properNames($username);

foreach($error as $result) {
    echo $result . '<br>';
}
?>

I am managing to output $username, but I am not managing to output $error[] if it is a number. $error[] in my case is an array as different classes will have an error.

The current code is telling me Array Warning: Invalid argument supplied for foreach() in /web/com/140895582016925/main.php on line 22 which is for foreach($error as $result) {

Answer 1

The error message say it all: your $error is NOT an array.

Take a look at the is_numeric() validation part of your code.
You have an error there.
is_numeric() needs an argument.
In your case i think you need to:

if ( is_numeric($formValue ) )
{
// execute if condition
}

Answer 2

try this

   <?php
class SimpleEmailServiceMessage
{
    public $error;

    public function properNames($formValue) {
    $formValue = strtolower($formValue); //Make all letters small case
    $formValue = ucwords($formValue); //Make all first letters capital
    $formValue = str_replace('','',$formValue); //Remove extra spaces

    if(is_numeric($formValue)) {
      $this->error[] = 'The name is invalid';
    }
    return $formValue;
    }
}

$username = 'john doe';

$m = new SimpleEmailServiceMessage();
echo $m->properNames($username);

if(isset($m->error))
{
  foreach($m->error as $result) {
     echo $result . '<br>';
  }
}
?>

Demo

Answer 3

Try to use assignment:

$error = $m->properNames($username);

instead of echo ing:

echo $m->properNames($username);