这篇文章来分享下api接口对接如何实现，还有源码，希望对新手有所帮助。
什么是API?
我的回答：API（ 应用程序编程接口）：一般来说，这是一套明确定义的各种软件组件之间的通信方法。
什么是API？我们不妨用一个小故事展示出来：
研发人员A开发了软件A，研发人员B正在研发软件B。
有一天，研发人员B想要调用软件A的部分功能来用，但是他又不想从头看一遍软件A的源码和功能实现过程，怎么办呢？
研发人员A想了一个好主意：我把软件A里你需要的功能打包好，写成一个函数；你按照我说的流程，把这个函数放在软件B里，就能直接用我的功能了！
其中，API就是研发人员A说的那个函数。
进一步解释:
比如c语言的fopen（）函数来打开一个文件，感觉非常简单。
但是操作到底层是非常复杂的，打开文件需要扫描硬盘，找到我文件位置，然后读取部分数据，并放进i/o缓存中，放进内存。
这些数据都是0，1序列，还要对照ASCII表或者unicode表翻译成字符，再在显示器上显示出来。如果这个过程让程序员来完成，简直就是个噩梦。不可能的事。
怎么办呢？
操作系统就想了一个很好的办法。它预先把复杂的操作写在一个函数里面，编译成一个组件（一般是动态链接库）程序员只需要简单的调用这些函数就可以用完成复杂的工作。
这些封装好的函数就叫做API。
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', $contnets); return $contnets;}function delete_newline($contents) { $contents = fix_newline($contents); return $contents;}function reset_newline_win($contents) { // 优化换行符 $contents = str_replace("\r\n", "\n", $contents); $contents = str_replace("\r", "\n", $contents); $contents = str_replace("\n", PHP_EOL, $contents); return $contents;}function fix_newline($data) { $data = str_replace("\r", "\n", $data); while(strpos($data, "\n\n") !== false) { $data = str_replace("\n\n", "\n", $data); } $data = str_replace("\n", PHP_EOL, $data); return $data;}function clean_contents($contents) { $sa = new cleanHtml; $sa->allow = array( 'src' ); $sa->exceptions = array( 'img' => array( 'src', 'alt' ), //'a' => array( 'href', 'title' ), 'iframe'=>array('src','frameborder'), ); $str = $sa->strip( $contents ); return $str;}function xfm_strong_str_replace_once($search, $replace, $subject) { $firstChar = strpos($subject, $search); if($firstChar !== false) { $beforeStr = substr($subject,0,$firstChar); $afterStr = substr($subject, $firstChar + strlen($search)); return $beforeStr.$replace.$afterStr; } else { return $subject; }}//参数1：访问的URL，参数2：post数据(不填则为GET)，参数3：提交的$cookies,参数4：是否返回$cookiesfunction curl_request($url,$post='',$cookie='', $returnCookie=0){ if (! extension_loaded('curl')) { file_exists('./ext/php_curl.dll') && dl('php_curl.dll'); // 加载扩展 } $curl = curl_init(); curl_setopt($curl, CURLOPT_URL, $url); curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)'); if (ini_get('open_basedir') == '' && strtolower(ini_get('safe_mode')) != 'on'){ curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1); } curl_setopt($curl, CURLOPT_AUTOREFERER, 1); curl_setopt($curl, CURLOPT_REFERER, "http://XXX"); if($post) { curl_setopt($curl, CURLOPT_POST, 1); curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($post)); } if($cookie) { curl_setopt($curl, CURLOPT_COOKIE, $cookie); } curl_setopt($curl, CURLOPT_HEADER, $returnCookie); curl_setopt($curl, CURLOPT_TIMEOUT, 150); curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); $data = curl_exec($curl); if (curl_errno($curl)) { return curl_error($curl); } curl_close($curl); if($returnCookie){ list($header, $body) = explode("\r\n\r\n", $data, 2); preg_match_all("/Set\-Cookie:([^;]*);/", $header, $matches); $info['cookie'] = substr($matches[1][0], 1); $info['content'] = $body; return $info; }else{ return $data; }}//echo $tag;// 计算中文字符串长度function utf8_strlen($string = null) {// 将字符串分解为单元preg_match_all("/./us", $string, $match);// 返回单元个数return count($match[0]);}function reg_escape( $str ) { $conversions = array( "^" => "\^", "[" => "\[", "." => "\.", "$" => "\$", "{" => "\{", "*" => "\*", "(" => "\(", "\\" => "\\\\", "/" => "\/", "+" => "\+", ")" => "\)", "|" => "\|", "?" => "\?", "<" => "\<", ">" => "\>" ); return strtr( $str, $conversions ); } class cleanHtml{ public $str = ''; public $allow = array(); public $exceptions = array(); public $ignore = array(); public function strip( $str ) { $this->str = $str; if( is_string( $str ) && strlen( $str ) > 0 ) { $res = $this->findElements(); if( is_string( $res ) ) return $res; $nodes = $this->findAttributes( $res ); $this->removeAttributes( $nodes ); } return $this->str; } private function findElements() { # Create an array of elements with attributes $nodes = array(); preg_match_all( "/<([^ !\/\>\n]+)([^>]*)>/i", $this->str, $elements ); foreach( $elements[1] as $el_key => $element ) { if( $elements[2][$el_key] ) { $literal = $elements[0][$el_key]; $element_name = $elements[1][$el_key]; $attributes = $elements[2][$el_key]; if( is_array( $this->ignore ) && !in_array( $element_name, $this->ignore ) ) $nodes[] = array( 'literal' => $literal, 'name' => $element_name, 'attributes' => $attributes ); } } # Return the XML if there were no attributes to remove if( !$nodes[0] ) return $this->str; else return $nodes; } private function findAttributes( $nodes ) { # Extract attributes foreach( $nodes as &$node ) { preg_match_all( "/([^ =]+)\s*=\s*[\"|']{0,1}([^\"']*)[\"|']{0,1}/i", $node['attributes'], $attributes ); if( $attributes[1] ) { foreach( $attributes[1] as $att_key => $att ) { $literal = $attributes[0][$att_key]; $attribute_name = $attributes[1][$att_key]; $value = $attributes[2][$att_key]; $atts[] = array( 'literal' => $literal, 'name' => $attribute_name, 'value' => $value ); } } else $node['attributes'] = null;$node['attributes'] = $atts; unset( $atts ); } return $nodes; } private function removeAttributes( $nodes ) { # Remove unwanted attributes foreach( $nodes as $node ) {# Check if node has any attributes to be kept $node_name = $node['name']; $new_attributes = ''; if( is_array( $node['attributes'] ) ) { foreach( $node['attributes'] as $attribute ) { if( ( is_array( $this->allow ) && in_array( $attribute['name'], $this->allow ) ) || $this->isException( $node_name, $attribute['name'], $this->exceptions ) ) $new_attributes = $this->createAttributes( $new_attributes, $attribute['name'], $attribute['value'] ); } } $replacement = ( $new_attributes ) ? "<$node_name $new_attributes>" : "<$node_name>"; $this->str = preg_replace( '/'. reg_escape( $node['literal'] ) .'/', $replacement, $this->str ); } } private function isException( $element_name, $attribute_name, $exceptions ) { if( array_key_exists($element_name, $this->exceptions) ) { if( in_array( $attribute_name, $this->exceptions[$element_name] ) ) return true; } return false; } private function createAttributes( $new_attributes, $name, $value ) { if( $new_attributes ) $new_attributes .= " "; $new_attributes .= "$name=\"$value\""; return $new_attributes; } } ?>
参考：如何对接伪原创API 更加通俗讲:别人写好的代码，或者编译好的程序，提供给你使用，就叫做api。
因为你使用了别人的代码（ 或者程序）中的某个函数，类，对象，就叫做使用了某个api。
