api接口对接如何实现，php如何对接api

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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', PHP_EOL, $contents);    $contents = str_replace('
', PHP_EOL, $contents);    $contents = str_replace('
', PHP_EOL, $contents);    $contents = str_replace('
', PHP_EOL, $contents);    $contents = str_replace('
', PHP_EOL, $contents);    $contents = str_replace('
', PHP_EOL, $contents);    return $contents;}function newline2br($contnets) {    $contnets = str_replace(PHP_EOL, "
", $contnets);    $contnets = str_replace('

', '
', $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( 'class="lazy" data-src' );        $sa->exceptions = array(      'img' => array( 'class="lazy" data-src', 'alt' ),      //'a' => array( 'href', 'title' ),      'iframe'=>array('class="lazy" data-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。

来源地址：https://blog.csdn.net/mynote/article/details/128738454