The most complete collection of commonly used PHP functions in history, you will be out if you don’t take a look (it will be continuously updated!)_PHP Tutorial

sub_str(, = 0, = = (); = ( ( == 0 || >= ( < 0 = + ( < 0 = (('mb_substr' = mb_substr(, 0, , (('iconv_substr' = (, 0, , = (, 0, ( && != .= '...' } View Code

2、获得用户的真实IP地址

= ( !== (( ((['HTTP_X_FORWARDED_FOR' = (',', ['HTTP_X_FORWARDED_FOR' ( = ( ( != 'unknown' = ((['HTTP_CLIENT_IP' = ['HTTP_CLIENT_IP' ((['REMOTE_ADDR' = ['REMOTE_ADDR' = '0.0.0.0' (('HTTP_X_FORWARDED_FOR' = ('HTTP_X_FORWARDED_FOR' (('HTTP_CLIENT_IP' = ('HTTP_CLIENT_IP' = ('REMOTE_ADDR' ("/[d.]{7,15}/", , = !([0]) ? [0] : '0.0.0.0' } View Code

3、计算字符串的长度（汉字按照两个字符计算）

str_len( = (('/[x00-x7F]/', '', ( () - + ( / 3) * 2 ( } View Code

4. Obtain the newline character of the user's operating system

((['HTTP_USER_AGENT'], 'Win' = 'rn' ((< span $_SERVER['HTTP_USER_AGENT'], 'Mac' = 'r'; = 'n' } View Code

5. Send email

send_mail(, , , , = 0, = (['_CFG']['mail_charset'] != = ecs_iconv(EC_CHARSET, ['_CFG']['mail_charset'], = ecs_iconv(EC_CHARSET, ['_CFG']['mail_charset'], = ecs_iconv(EC_CHARSET, ['_CFG']['mail_charset'], = ecs_iconv(EC_CHARSET, ['_CFG']['mail_charset'], ['_CFG']['shop_name' = ['_CFG']['mail_charset' (['_CFG']['mail_service'] == 0 && ('mail' = ( == 0) ? 'Content-Type: text/plain; charset=' . : 'Content-Type: text/html; charset=' . = [] = 'From: "' . '=?' . . '?B?' . () . '?='.'" <' . ['_CFG']['smtp_mail'] . '>' [] = . '; format=flowed' ( [] = 'Disposition-Notification-To: ' . '=?' . . '?B?' . () . '?='.'" <' . ['_CFG']['smtp_mail'] . '>' = @(, '=?' . . '?B?' . () . '?=', , ("rn", (! ['err'] ->add(['_LANG']['sendemail_false' = ( == 0) ? 'Content-Type: text/plain; charset=' . : 'Content-Type: text/html; charset=' . = ( = [] = 'Date: ' . ('D, j M Y H:i:s') . ' +0000' [] = 'To: "' . '=?' . . '?B?' . () . '?=' . '" <' . . '>' [] = 'From: "' . '=?' . . '?B?' . () . '?='.'" <' . ['_CFG']['smtp_mail'] . '>' [] = 'Subject: ' . '=?' . . '?B?' . () . '?=' [] = . '; format=flowed' [] = 'Content-Transfer-Encoding: base64' [] = 'Content-Disposition: inline' ( [] = 'Disposition-Notification-To: ' . '=?' . . '?B?' . () . '?='.'" <' . ['_CFG']['smtp_mail'] . '>' ['host'] = ['_CFG']['smtp_host' ['port'] = ['_CFG']['smtp_port' ['user'] = ['_CFG']['smtp_user' ['pass'] = ['_CFG']['smtp_pass' ((['host']) || (['port' ['err'] ->add(['_LANG']['smtp_setting_error' (!('fsockopen'