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PHP provides useful functions can read text file directly instead of open → read → close: readfile(), file_get_contents() - personally I prefer to use file_get_contents(), because it does not display anything after reading the content.

Option 1) file_get_contents( $filename)

file_get_contents() returns string read from the source file requested.

$src = "src/new.json";
$tmp = file_get_contents( $src);
echo $tmp;

If you modify something and want to save that file, you can also use file_put_contents($filename, $src)

Option 2) readfile( $filename)

readfile() return the text stream and shows its content while reading.

$src = "src/new.json";
$tmp = readfile( $src);
echo $tmp;