What are common mistakes when reading a file, processing a string, and saving it back in PHP?

Common mistakes when reading a file, processing a string, and saving it back in PHP include not properly handling file permissions, not closing the file after reading, and not properly sanitizing user input before saving it back. To solve these issues, make sure to set the correct file permissions, close the file after reading or writing, and sanitize user input to prevent any security vulnerabilities. 

// Reading a file, processing a string, and saving it back in PHP

// Read the file
$file = fopen("example.txt", "r") or die("Unable to open file!");
$content = fread($file, filesize("example.txt"));
fclose($file);

// Process the string (e.g., convert to uppercase)
$processedContent = strtoupper($content);

// Save the processed content back to the file
$file = fopen("example.txt", "w") or die("Unable to open file!");
fwrite($file, $processedContent);
fclose($file);

Keywords

file handling string manipulation PHP functions error handling data processing

Related Questions