file_exists

Question

我想检查文件是否存在并显示已定义的图像。我尝试使用如下代码。它总是显示no.png甚至只有1111.pdf存在！

$fileUrl = "http://localhost/Report/1111.pdf";
 $AgetHeaders = @get_headers($sourcePath);
 if (preg_match("|200|", $AgetHeaders[0])) {
 // file exists
echo "<img src='http://localhost/Report/yes.png'>";
 } else {
 // file doesn't exists
echo "<img src='http://localhost/Report/no.png'>";
 }

Answer 1

你尝试使用谷歌搜索吗？

file_exists function

file_exists

file_exists - 检查文件或目录是否存在

bool file_exists（string $ filename）

示例：

<?php
$filename = '/path/to/foo.txt';

if (file_exists($filename)) {
    echo "The file $filename exists";
} else {
    echo "The file $filename does not exist";
}
?>

Answer 2

使用此功能： -

if (file_exists('filename')) {
 …do something
 }

Answer 3

如果要检查外部文件

，可以尝试此功能

function curl_check_file_exist($url)
{
     $rarr = array();
    $useragent = "Mozilla/5.0 (Linux; U; Android 2.2; en-us; Nexus One Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_VERBOSE, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, $useragent); //set our user agent
    curl_setopt($ch, CURLOPT_TIMEOUT, 10); 
    $result = curl_exec($ch);
    $info = curl_getinfo($ch);
    $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);

   $header = substr($result, 0, $header_size);
   $result = substr($result, $header_size);
   $ok = $info['http_code'];


   if($ok == 200)
   {
     return true;
   }
   else
   {
    return false;
  }
 }

像这样

 if(curl_check_file_exist($url))
 {
    .....

 }
 else
 {
    .....
 }

但我想检查本地文件

file_exists(path)

功能很好

在PHP中检查文件是否存在

3 个答案:

file_exists