Question

所以，在代码中，我有这个

$availableOptions = array( 'run' => 'runs a script',
                           'list' => 'list all available scripts',
                           'help' => 'shows help');
....
elseif (in_array($option, $availableOptions)) {
    echo "- " . greenString($option) . " - " . $availableOptions[$option];
    echo "- " . greenString("SYNTAX: ") . $optionsSyntaxes[$option];
    echo greenString("-------------------------------\n\n");
}

但出于某种原因，无论我投入什么，它都会评估为假。所以我在交互式shell中尝试了它，当我不运行该函数并运行var_dump（$ availableOptions）时，它运行正常。当我添加该功能然后尝试它，即使我手动重新启动它也会失败。这真的很奇怪。

php > help();
PHP Fatal error:  Call to undefined function greenString() in php shell code on line 9
php > var_dump($availableOptions);
PHP Notice:  Undefined variable: availableOptions in php shell code on line 1
NULL
php > $availableOptions = array( 'run' => 'runs a script', 'list' => 'list all available scripts', 'help' => 'shows help');
php > var_dump($availableOptions);
PHP Notice:  Undefined variable: availableOptions in php shell code on line 1
NULL

在运行之前：

php > var_dump($availableOptions);
array(3) {
  ["run"]=>
  string(13) "runs a script"
  ["list"]=>
  string(26) "list all available scripts"
  ["help"]=>
  string(10) "shows help"
}
php >

运行函数后，数组变为未定义

0 个答案: