The example in this article describes the method of PHP verification form to detect whether the field is empty. Share it with everyone for your reference. The details are as follows:
PHP verifies the form and detects whether the fields are empty. When there are unfilled fields in the form, an error message will be displayed.
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$errorcount=0;
if (!trim($_POST['nickname'])) {
echo "
Nickname is required.";
$errorcount ;
}
if (!trim($_POST['title'])) {
echo "
Title is required.";
$errorcount ;
}
if ($errors > 0)
echo "
Please use your browser's back button " .
"to return to the form, and correct error(s)";
?>
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" " (ASCII 32 (0×20)), an ordinary space.
"t" (ASCII 9 (0×09)), a tab.
"n" (ASCII 10 (0x0A)), a new line (line feed).
"r" (ASCII 13 (0x0D)), a carriage return.
"
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