From b4d287adc210f50c56ebaa5f079b2e98f9404c2a Mon Sep 17 00:00:00 2001
From: sugar1569 <sugar1569@vip.qq.com>
Date: Tue, 16 Jul 2019 10:42:59 +0800
Subject: [PATCH] =?UTF-8?q?filterEmoji=20=E7=BC=BA=E5=B0=91=E5=87=BD?=
 =?UTF-8?q?=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 application/common.php | 49 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/application/common.php b/application/common.php
index 519a6707..05c2db1a 100644
--- a/application/common.php
+++ b/application/common.php
@@ -57,4 +57,53 @@ function makePathToUrl($path,$type = 2)
         return trim(str_replace(DS, '/',UPLOAD_PATH.$path),'.');
     }else return '';
 
+}
+// 过滤掉emoji表情
+function filterEmoji($str)
+{
+    $str = preg_replace_callback(    //执行一个正则表达式搜索并且使用一个回调进行替换
+        '/./u',
+        function (array $match) {
+            return strlen($match[0]) >= 4 ? '' : $match[0];
+        },
+        $str);
+    return $str;
+}
+
+//可逆加密
+function encrypt($data, $key) {
+    $prep_code = serialize($data);
+    $block = mcrypt_get_block_size('des', 'ecb');
+    if (($pad = $block - (strlen($prep_code) % $block)) < $block) {
+        $prep_code .= str_repeat(chr($pad), $pad);
+    }
+    $encrypt = mcrypt_encrypt(MCRYPT_DES, $key, $prep_code, MCRYPT_MODE_ECB);
+    return base64_encode($encrypt);
+}
+
+//可逆解密
+function decrypt($str, $key) {
+    $str = base64_decode($str);
+    $str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
+    $block = mcrypt_get_block_size('des', 'ecb');
+    $pad = ord($str[($len = strlen($str)) - 1]);
+    if ($pad && $pad < $block && preg_match('/' . chr($pad) . '{' . $pad . '}$/', $str)) {
+        $str = substr($str, 0, strlen($str) - $pad);
+    }
+    return unserialize($str);
+}
+//替换一部分字符
+/**
+ * @param $string 需要替换的字符串
+ * @param $start 开始的保留几位
+ * @param $end 最后保留几位
+ * @return string
+ */
+function strReplace($string,$start,$end)
+{
+    $strlen = mb_strlen($string, 'UTF-8');//获取字符串长度
+    $firstStr = mb_substr($string, 0, $start,'UTF-8');//获取第一位
+    $lastStr = mb_substr($string, -1, $end, 'UTF-8');//获取最后一位
+    return $strlen == 2 ? $firstStr . str_repeat('*', mb_strlen($string, 'utf-8') -1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr;
+
 }
\ No newline at end of file