feat:修改post，支持json提交数据

 <?php
+
 namespace Jiaoyin;
 
-class Curl{
+class Curl
+{
 
     // get 获取数据
-    static public function httpGet($url, $param=[], $header=[]){
-        if(empty($url)){
+    static public function httpGet($url, $param = [], $header = [])
+    {
+        if (empty($url)) {
             return false;
         }
-        if(count($param) > 0){
-        	$url = $url.'?'.http_build_query($param);
+        if (count($param) > 0) {
+            $url = $url . '?' . http_build_query($param);
         }
         $ch = curl_init();
-        $ch = self::curlSet($ch,$url, $header);
+        $ch = self::curlSet($ch, $url, $header);
         $output = curl_exec($ch);
-        if($output === false){
+        if ($output === false) {
             echo 'Curl error: ' . curl_error($ch);
         }
         curl_close($ch);
@@ -22,41 +25,50 @@ class Curl{
     }
 
     //post 获取数据
-    static public function httpPost($url, $param=[], $header=[]){
-        if(empty($url)){
+    static public function httpPost($url, $param = [], $header = [])
+    {
+        if (empty($url)) {
             return false;
         }
         $ch = curl_init();
         $ch = self::curlSet($ch, $url, $header);
-        $opts=[];
-        $opts[CURLOPT_POST]=1;
-        $opts[CURLOPT_USERAGENT]="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.98 Safari/537.36";
-        if (!empty($header) && in_array('Content-Type:application/json', $header)) {
-            $opts[CURLOPT_POSTFIELDS]= json_encode($param);
-        } else {
-            $opts[CURLOPT_POSTFIELDS] = http_build_query($param);
+        $opts = [];
+        $opts[CURLOPT_POST] = 1;
+        $opts[CURLOPT_USERAGENT] = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.98 Safari/537.36";
+
+        // 修改判断逻辑
+        $isJson = false;
+        foreach ($header as $h) {
+            if (stripos($h, 'Content-Type: application/json') !== false) {
+                $isJson = true;
+                break;
             }
+        }
+
+        $opts[CURLOPT_POSTFIELDS] = $isJson ? json_encode($param) : http_build_query($param);
+
         curl_setopt_array($ch, $opts);
         $output = curl_exec($ch);
-        if($output === false){
+        if ($output === false) {
             echo 'Curl error: ' . curl_error($ch);
         }
         curl_close($ch);
         return $output;
     }
     //delete 请求
-    static public function httpDelete($url, $param=[], $header=[]){
-        if(empty($url)){
+    static public function httpDelete($url, $param = [], $header = [])
+    {
+        if (empty($url)) {
             return false;
         }
-        if(count($param) > 0){
-        	$url = $url.'?'.http_build_query($param);
+        if (count($param) > 0) {
+            $url = $url . '?' . http_build_query($param);
         }
         $ch = curl_init();
         $ch = self::curlSet($ch, $url, $header);
         curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
         $output = curl_exec($ch);
-        if($output === false){
+        if ($output === false) {
             echo 'Curl error: ' . curl_error($ch);
         }
         curl_close($ch);
@@ -64,15 +76,16 @@ class Curl{
     }
 
     //curl 参数设置
-    static private function curlSet($ch,$url, $header){
-        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true) ;
+    static private function curlSet($ch, $url, $header)
+    {
+        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
         curl_setopt($ch, CURLOPT_URL, $url);
         //参数为1表示传输数据，为0表示直接输出显示。
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
         //参数为0表示不带头文件，为1表示带头文件
-        curl_setopt($ch, CURLOPT_HEADER,0);
-        if(!empty($header)){
-            curl_setopt($ch, CURLOPT_HTTPHEADER,$header);
+        curl_setopt($ch, CURLOPT_HEADER, 0);
+        if (!empty($header)) {
+            curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
         }
         // 关闭SSL验证
         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);