FunctionWithReferenceFixture.php

<?php
function /*comment*/ &function_with_return_by_reference_and_param($param) {
    echo $param;
    return $param;
}

function function_with_static_var() {
  static $static1,
    $static_num = 12,
    $static_neg_num = -1.5, // Unused variable $static_neg_num
    $static_string = 'abc', // Unused variable $static_string
    $static_string2 = "def", // Unused variable $static_string2
    $static_define = MYDEFINE, // Unused variable $static_define
    $static_constant = MyClass::CONSTANT, // Unused variable $static_constant
    $static2,
    $static_new_unused = new Foobar(), // Unused variable $static_new_unused
    $static_new = new Foobar();
    static $static_heredoc = <<<END_OF_HEREDOC
this is an ugly but valid way to continue after a heredoc
END_OF_HEREDOC
        , $static3;
    static $static_nowdoc = <<<'END_OF_NOWDOC'
this is an ugly but valid way to continue after a nowdoc
END_OF_NOWDOC
        , $static4;
    echo $static1;
    echo $static_num;
    echo $static2;
    echo $var; // Undefined variable $var
    echo $static_heredoc;
    echo $static3;
    echo $static_nowdoc;
    echo $static4 . $static_new;
}

function function_with_pass_by_reference_param(&$param) {
    echo $param;
}

function function_with_pass_by_reference_calls() {
    echo $matches; // Undefined variable $matches
    echo $needle; // Undefined variable $needle
    echo $haystack; // Undefined variable $haystack
    preg_match('/(abc)/', 'defabcghi', /* comment */ $matches);
    preg_match(
      $needle, // Undefined variable $needle
      'defabcghi',
      $matches
    );
    preg_match(
      '/(abc)/',
      $haystack, // Undefined variable $haystack
      $matches
    );
    echo $matches;
    echo $needle; // Undefined variable $needle
    echo $haystack; // Undefined variable $haystack
    $stmt = 'whatever';
    $var1 = 'one';
    $var2 = 'two';
    echo $var1;
    echo $var2;
    echo $var3; // Undefined variable $var3
    maxdb_stmt_bind_result /*comment*/ ($stmt, $var1, $var2, $var3);
    echo $var1;
    echo $var2;
    echo $var3;
}

function function_with_pass_by_ref_assign_only_arg(&  /*comment*/  $return_value) {
    $return_value = 42;
}

function function_with_ignored_reference_call() {
    $foo = 'bar';
    my_reference_function($foo, $baz, $bip); // Undefined variable $bar, Undefined variable $bip
    another_reference_function($foo, $foo2, $foo3); // Undefined variable $foo2, Undefined variable $foo3
}

function function_with_wordpress_reference_calls() {
    wp_parse_str('foo=bar', $vars); // Undefined variable $vars
}

function function_with_array_walk($userNameParts) {
  array_walk($userNameParts, function (string &$value): void {
    if (strlen($value) <= 3) {
      return;
    }

    $value = ucfirst($value);
  });
}

function function_with_foreach_with_reference($derivatives, $base_plugin_definition) {
  foreach ($derivatives as &$entry) {
    $entry .= $base_plugin_definition;
  }
  foreach ($derivatives as &$unused) { // Unused variable $unused
    $base_plugin_definition .= '1';
  }
  return $derivatives;
}

function function_with_ignored_reference_call_with_namespace() {
    $foo = 'bar';
    \My\Functions\my_reference_function($foo, $baz, $bip); // Undefined variable $bar, Undefined variable $bip
}