PHP中的Exec不起作用，而从提示符运行命令时则可以正常工作 - Exec in PHP doesn't work whereas the command works fine when run from the prompt

Exec in PHP doesn't work whereas the command works fine when run from the prompt

我试图在基于Windows的Apache服务器上使用tesseract执行OCR。这让我很生气。下面的命令不会产生期望的E:'zzz.txt文件:

<?php
$command = "'"C:''ocr''tesseract.exe'" '"E:''www''test''upload''proofs''src''yehia.raef.jpg'" '"E:''zzz'" 2>&1";
print $command;
exec("$command", $msg);
print_r($msg);
?>

当我运行程序时，得到的结果如下:

C:'Users'blob'Desktop>php ici.php
"C:'ocr'tesseract.exe" "E:'www'test'upload'proofs'src'yehia.raef.jpg" "E:'zzz" 2>&1
Array
(
    [0] => The filename, directory name, or volume label syntax is incorrect.
)

但是现在如果从提示符直接运行命令:

C:'Users'blob'Desktop>"C:'ocr'tesseract.exe" "E:'www'test'upload'proofs'src'yehia.raef.jpg" "E:'zzz" 2>&
Tesseract Open Source OCR Engine v3.02 with Leptonica

效果很好。请注意，这种命令完全可以与其他软件一起使用，例如ImageMagick…

帮助!

假设PHP具有所有必需的权限，在Windows上运行的PHP/5.3.0之前的PHP版本中，您需要在完整的命令周围添加一组额外的引号:

<?php
$command = "'"C:''ocr''tesseract.exe'" '"E:''www''test''upload''proofs''src''yehia.raef.jpg'" '"E:''zzz'" 2>&1";
if( PHP_OS=='WINNT' && version_compare(PHP_VERSION, '5.3.0', '<') ){
    $command = '"' . $command . '"';
}
print $command;