Online PHP editor | output for QBTd1

@ 2023-11-05T16:36:13Z

<?php

/ returns true if property is safely accessible publicly by using $obj->$prop:
function public_property_exists( $obj, $prop ){
  / allow magic $obj->__isset( $prop ) to execute if exists
  if( isset( $obj->$prop ))  return true;
  
  / no public/protected/private property exists with this name
  if( ! property_exists( $obj, $prop ))  return false;

  / the property exists, but is it public?
  $rp = new ReflectionProperty( $obj, $prop );
  return $rp->isPublic();
}

class C {
  public    $public    = "I’m public!";
  protected $protected = "I’m public!";
  private   $private   = "I’m public!";
  function __isset( $k ){
    return substr( $k, 0, 5 ) === 'magic';
  }
  function __get( $k ){
    if( $k === 'magic_isset_but_null')  return null;
    return "I’m {$k}!";
  }
}

$o = new C();
foreach( array(
  'public', 'protected', 'private',
  'magic', 'magic_isset_but_null',
  'missing'
) as $prop ){
  if( public_property_exists( $o, $prop ))
        echo "\$o->{$prop} is a public property, its value is: ",
             var_export( $o->$prop, true ), "\n";
  else  echo "\$o->{$prop} is not a public property.\n";
}

Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.20, 8.4.1 - 8.4.6: $o->public is a public property, its value is: 'I’m public!' $o->protected is not a public property. $o->private is not a public property. $o->magic is a public property, its value is: 'I’m magic!' $o->magic_isset_but_null is a public property, its value is: NULL $o->missing is not a public property.
Output for 5.0.0 - 5.0.5: $o->public is a public property, its value is: 'I’m public!' Fatal error: Cannot access protected property C::$protected in /in/QBTd1 on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/QBTd1 on line 17
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/QBTd1 on line 17
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/QBTd1 on line 17
Process exited with code 255.

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