What potential issue might arise when using the file() function in PHP to read a text file into an array?

When using the file() function in PHP to read a text file into an array, one potential issue that might arise is that the entire contents of the file are loaded into memory at once. This can be problematic if the file is very large, as it can consume a lot of memory and potentially cause performance issues. To solve this issue, you can use the fopen() function to open the file and read it line by line using fgets(). 

$lines = [];
$handle = fopen("file.txt", "r");
if ($handle) {
    while (($line = fgets($handle)) !== false) {
        $lines[] = $line;
    }
    fclose($handle);
} else {
    echo "Error opening the file.";
}

Keywords

file() PHP text file array error

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