file_put_contents image save function return value after success

When I saved the image today, I used file_put_contents() to save the image. I ran it several times, but no data came out. I thought it was because the function did not operate successfully. So I checked the usage and return value of this function and found that The returns I output were all correct, but later I found out that it was caused by other reasons. Now let me share the usage of this function:

file_put_contents() function is the most suitable choice for writing strings or appending string contents to a file at one time. The

file_put_contents() function is used to write a string into a file, and returns the number of bytes of data written to the file successfully, otherwise it returns FALSE.

Syntax:

int file_put_contents (string filename, string data [, int flags [, resource context]])

Parameter description: Parameter Description
filename The name of the file to write data to
data The data to be written. The type can be string, array (but not multi-dimensional array), or stream resource
flags are optional and specify how to open/write the file. Possible values:
FILE_USE_INCLUDE_PATH: Check the built-in path for a copy of filename

FILE_APPEND: Write data by appending to the end of the file
LOCK_EX: Lock the file

context Optional, Context is a set of options that can be modified Text attribute Example:
echo file_put_contents("test.txt", "This is something.");
?>
Run this example, the browser output:
18
And the test.txt file ( In the same directory as the program) the content is: This is something..



The above has introduced the return value of the file_put_contents image saving function after success, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.