字符串助手函数
class Str
{
/**
* 检查字符串中是否包含某些字符串
* @param string $haystack
* @param string|array $needles
* @return bool
*/
public static function contains($haystack, $needles)
{
foreach ((array)$needles as $needle) {
if ($needle != '' && mb_strpos($haystack, $needle) !== false) {
return true;
}
}
return false;
}
/**
* 检查字符串是否以某些字符串结尾
*
* @param string $haystack
* @param string|array $needles
* @return bool
*/
public static function endsWith($haystack, $needles)
{
foreach ((array)$needles as $needle) {
if ((string)$needle === static::substr($haystack, -static::length($needle))) {
return true;
}
}
return false;
}
/**
* 检查字符串是否以某些字符串开头
*
* @param string $haystack
* @param string|array $needles
* @return bool
*/
public static function startsWith($haystack, $needles)
{
foreach ((array)$needles as $needle) {
if ($needle != '' && mb_strpos($haystack, $needle) === 0) {
return true;
}
}
return false;
}
/**
* 获取指定长度的随机字母数字组合的字符串
*
* @param int $length
* @return string
*/
public static function random($length = 16)
{
$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
return static::substr(str_shuffle(str_repeat($pool, $length)), 0, $length);
}
/**
* 字符串转小写
*
* @param string $value
* @return string
*/
public static function lower($value)
{
return mb_strtolower($value, 'UTF-8');
}
/**
* 字符串转大写
*
* @param string $value
* @return string
*/
public static function upper($value)
{
return mb_strtoupper($value, 'UTF-8');
}
/**
* 获取字符串的长度
*
* @param string $value
* @return int
*/
public static function length($value)
{
return mb_strlen($value);
}
/**
* 截取字符串
*
* @param string $string
* @param int $start
* @param int|null $length
* @return string
*/
public static function substr($string, $start, $length = null)
{
return mb_substr($string, $start, $length, 'UTF-8');
}
}
