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<?php
namespace Drupal\Component\Utility;
/**
* Provides helpers for dealing with variables.
*
* @ingroup utility
*/
class Variable {
/**
* Drupal-friendly var_export().
*
* @param mixed $var
* The variable to export.
* @param string $prefix
* A prefix that will be added at the beginning of every lines of the output.
*
* @return string
* The variable exported in a way compatible to Drupal's coding standards.
*/
public static function export($var, $prefix = '') {
if (is_array($var)) {
if (empty($var)) {
$output = 'array()';
}
else {
$output = "array(\n";
// Don't export keys if the array is non associative.
$export_keys = array_values($var) != $var;
foreach ($var as $key => $value) {
$output .= ' ' . ($export_keys ? static::export($key) . ' => ' : '') . static::export($value, ' ', FALSE) . ",\n";
}
$output .= ')';
}
}
elseif (is_bool($var)) {
$output = $var ? 'TRUE' : 'FALSE';
}
elseif (is_string($var)) {
if (strpos($var, "\n") !== FALSE || strpos($var, "'") !== FALSE) {
// If the string contains a line break or a single quote, use the
// double quote export mode. Encode backslash, dollar symbols, and
// double quotes and transform some common control characters.
$var = str_replace(['\\', '$', '"', "\n", "\r", "\t"], ['\\\\', '\$', '\"', '\n', '\r', '\t'], $var);
$output = '"' . $var . '"';
}
else {
$output = "'" . $var . "'";
}
}
elseif (is_object($var) && get_class($var) === 'stdClass') {
// var_export() will export stdClass objects using an undefined
// magic method __set_state() leaving the export broken. This
// workaround avoids this by casting the object as an array for
// export and casting it back to an object when evaluated.
$output = '(object) ' . static::export((array) $var, $prefix);
}
else {
$output = var_export($var, TRUE);
}
if ($prefix) {
$output = str_replace("\n", "\n$prefix", $output);
}
return $output;
}
}