PHP - Get Bool to Echo False When False

PHP - Get bool to echo false when false

echo $bool_val ? 'true' : 'false';

Or if you only want output when it's false:

echo !$bool_val ? 'false' : '';

PHP printed boolean value is empty, why?

Be careful when you convert back and forth with boolean, the manual says:

A boolean TRUE value is converted to the string "1". Boolean FALSE is
converted to "" (the empty string). This allows conversion back and
forth between boolean and string values.

So you need to do a:

echo (int)$local_rates_file_exists."<br>";

Why doesn't PHP print TRUE/FALSE?

From the manual:

A boolean TRUE value is converted to the string "1". Boolean FALSE is converted to "" (the empty string). This allows conversion back and forth between boolean and string values.

How to have PHP boolean FALSE to be output as FALSE only

echo '<script type="text/javascript">
          var a = '.($a?"true":"false").';
          var b = '.($b?"true":"false").';
      </script>';

I suppose, You cant simply echo true/false to get the word, You need to convert it to string.

True/False value giving output 1 or blank using PHP

PHP doesn't support printing True/False, so you can use following as a work-around:

echo $available_image ? 'true' : 'false';

Or even simpler, you can use:

echo json_encode($available_image);

Is there a way to get true/false string values from a Boolean in PHP?

PHP displays boolean values as 1 (true) or empty string (false) when outputted.

If you want to check if it's true or false use == (if implicit conversion is OK) or === (if it's not). For example:

echo $val ? 'true' : 'false'; // implicit conversion
echo $val === true ? 'true' : 'false'; // no conversion

I don't know of any way to make PHP output boolean values natively as true or false.

PHP boolean: why `true == 'false'` is true?

Because 'false' is not a false value, it is a string that contains something.

So when the comparison is made, 'false' is equal to true.

A value is false if :

• it is false : $val = false;
• it is an empty string : $val = "";
• it is zero : $val = 0;
• it is null : $val = null;

See comparisons documentation.

Why does boolval(false) return empty in php?

Following the examples in the documentation, this would be the way to show boolean values:

echo 'false: '.(boolval(false) ? 'true' : 'false')."\n";

See: http://php.net/manual/en/function.boolval.php

The manual also says:

A boolean TRUE value is converted to the string "1". Boolean FALSE is
converted to "" (the empty string). This allows conversion back and
forth between boolean and string values.

See: http://php.net/manual/en/language.types.string.php

---

Related Topics