How does PHP save the verification code image to a local device?

How does PHP save the verification code image to a local device? Recently I am working on some automated tasks, including verification code identification. the verification code image is similar to & lt; imgsrc = & quot;/index/image. jsp & quot; & gt; in this case, use the file_get_contents or curl of PHP to save the verification code image to the local device?
I am working on some automation tasks recently,
Verification code recognition,
The verification code image is similar

In this way,
Use file_get_contents or curl of PHP,
Save jpg and bmp files as usual,
An error occurred while saving the file,

Tips

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PHP code