Are there potential pitfalls in using trim and fgets functions together in PHP code?

When using trim and fgets functions together in PHP code, one potential pitfall is that the trim function may remove the newline character at the end of the string returned by fgets. This can lead to unexpected behavior when processing the input. To solve this issue, it is recommended to use rtrim instead of trim to remove only the trailing whitespace characters, leaving the newline intact. 

$handle = fopen("input.txt", "r");

if ($handle) {
    while (($line = fgets($handle)) !== false) {
        $line = rtrim($line); // Remove trailing whitespace characters
        // Process the line here
    }

    fclose($handle);
} else {
    echo "Error opening the file.";
}

Keywords

trim fgets PHP functions code

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