$key using this search criteria:
* - if $key is a constant then return it. Else
* - if $key is set in $_ENV then return it. Else
* - return $def.
*
* @param string $key The key to search for.
* @param string $def The default value to return.
* @return string the string value of the system property, or the default
* value if there is no property with that key.
*/
public static function getSystemProperty($key, $def) {
if(defined($key)) {
return (string)constant($key);
} else if(isset($_SERVER[$key])) {
return (string)$_SERVER[$key];
} else if(isset($_ENV[$key])) {
return (string)$_ENV[$key];
} else {
return $def;
}
}
/** Converts $value to boolean, or throws an exception if not possible. */
public static function toBooleanEx($value) {
if (isset($value)) {
if (is_bool($value)) {
return $value;
}
$value = strtolower(trim($value));
if (in_array($value, self::$trueValues)) {
return true;
}
if (in_array($value, self::$falseValues)) {
return false;
}
}
throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to boolean.");
}
/**
* Converts $value to integer, or throws an exception if not possible.
* Floats cannot be converted to integer.
*/
public static function toIntegerEx($value) {
if (is_integer($value)) {
return $value;
}
if (is_numeric($value) && ($value == (integer) $value)) {
return (integer) $value;
}
throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to integer.");
}
/**
* Converts $value to integer, or throws an exception if not possible.
* Floats cannot be converted to integer.
*/
public static function toPositiveIntegerEx($value) {
if (is_integer($value) && $value > 0) {
return $value;
}
if (is_numeric($value) && ($value == (integer) $value) && $value > 0) {
return (integer) $value;
}
throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to a positive integer.");
}
/** Converts the value to a level. Throws an exception if not possible. */
public static function toLevelEx($value) {
if ($value instanceof LoggerLevel) {
return $value;
}
$level = LoggerLevel::toLevel($value);
if ($level === null) {
throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to a logger level.");
}
return $level;
}
/**
* Converts a value to a valid file size (integer).
*
* Supports 'KB', 'MB' and 'GB' suffixes, where KB = 1024 B etc.
*
* The final value will be rounded to the nearest integer.
*
* Examples:
* - '100' => 100
* - '100.12' => 100
* - '100KB' => 102400
* - '1.5MB' => 1572864
*
* @param mixed $value File size (optionally with suffix).
* @return integer Parsed file size.
*/
public static function toFileSizeEx($value) {
if (empty($value)) {
throw new LoggerException("Empty value cannot be converted to a file size.");
}
if (is_numeric($value)) {
return (integer) $value;
}
if (!is_string($value)) {
throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to a file size.");
}
$str = strtoupper(trim($value));
$count = preg_match('/^([0-9.]+)(KB|MB|GB)?$/', $str, $matches);
if ($count > 0) {
$size = $matches[1];
$unit = $matches[2];
switch($unit) {
case 'KB': $size *= pow(1024, 1); break;
case 'MB': $size *= pow(1024, 2); break;
case 'GB': $size *= pow(1024, 3); break;
}
return (integer) $size;
}
throw new LoggerException("Given value [$value] cannot be converted to a file size.");
}
/**
* Converts a value to string, or throws an exception if not possible.
*
* Objects can be converted to string if they implement the magic
* __toString() method.
*
*/
public static function toStringEx($value) {
if (is_string($value)) {
return $value;
}
if (is_numeric($value)) {
return (string) $value;
}
if (is_object($value) && method_exists($value, '__toString')) {
return (string) $value;
}
throw new LoggerException("Given value [" . var_export($value, true) . "] cannot be converted to string.");
}
/**
* Performs value substitution for string options.
*
* An option can contain PHP constants delimited by '${' and '}'.
*
* E.g. for input string "some ${FOO} value", the method will attempt
* to substitute ${FOO} with the value of constant FOO if it exists.
*
* Therefore, if FOO is a constant, and it has value "bar", the resulting
* string will be "some bar value".
*
* If the constant is not defined, it will be replaced by an empty string,
* and the resulting string will be "some value".
*
* @param string $string String on which to perform substitution.
* @return string
*/
public static function substConstants($string) {
preg_match_all('/\${([^}]+)}/', $string, $matches);
foreach($matches[1] as $key => $match) {
$match = trim($match);
$search = $matches[0][$key];
$replacement = defined($match) ? constant($match) : '';
$string = str_replace($search, $replacement, $string);
}
return $string;
}
}