PHP - Get bool to echo false when false
PhpBooleanPhp Problem Overview
The following code doesn't print out anything:
$bool_val = (bool)false;
echo $bool_val;
But the following code prints 1
:
$bool_val = (bool)true;
echo $bool_val;
Is there a better way to print 0
or false
when $bool_val
is false
than adding an if
statement?
Php Solutions
Solution 1 - Php
echo $bool_val ? 'true' : 'false';
Or if you only want output when it's false:
echo !$bool_val ? 'false' : '';
Solution 2 - Php
This is the easiest way to do this:
$text = var_export($bool_value,true);
echo $text;
or
var_export($bool_value)
If the second argument is not true, it will output the result directly.
Solution 3 - Php
This will print out boolean value as it is, instead of 1/0.
$bool = false;
echo json_encode($bool); //false
Solution 4 - Php
No, since the other option is modifying the Zend engine, and one would be hard-pressed to call that a "better way".
Edit:
If you really wanted to, you could use an array:
$boolarray = Array(false => 'false', true => 'true');
echo $boolarray[false];
Solution 5 - Php
Try converting your boolean to an integer?
echo (int)$bool_val;
Solution 6 - Php
I like this one to print that out
var_dump ($var);
Solution 7 - Php
var_export
provides the desired functionality.
This will always print a value rather than printing nothing for null
or false
. var_export
prints a PHP representation of the argument it's passed, the output could be copy/pasted back into PHP.
var_export(true); // true
var_export(false); // false
var_export(1); // 1
var_export(0); // 0
var_export(null); // NULL
var_export('true'); // 'true' <-- note the quotes
var_export('false'); // 'false'
If you want to print strings "true"
or "false"
, you can cast to a boolean as below, but beware of the peculiarities:
var_export((bool) true); // true
var_export((bool) false); // false
var_export((bool) 1); // true
var_export((bool) 0); // false
var_export((bool) ''); // false
var_export((bool) 'true'); // true
var_export((bool) null); // false
// !! CAREFUL WITH CASTING !!
var_export((bool) 'false'); // true
var_export((bool) '0'); // false
Solution 8 - Php
echo(var_export($var));
When $var
is boolean variable, true
or false
will be printed out.
Solution 9 - Php
Solution 10 - Php
The %b
option of sprintf() will convert a boolean to an integer:
echo sprintf("False will print as %b", false); //False will print as 0
echo sprintf("True will print as %b", true); //True will print as 1
If you're not familiar with it: You can give this function an arbitrary amount of parameters while the first one should be your ouput string spiced with replacement strings like %b
or %s
for general string replacement.
Each pattern will be replaced by the argument in order:
echo sprintf("<h1>%s</h1><p>%s<br/>%s</p>", "Neat Headline", "First Line in the paragraph", "My last words before this demo is over");
Solution 11 - Php
You can use a ternary operator
echo false ? 'true' : 'false';
Solution 12 - Php
Your'e casting a boolean to boolean and expecting an integer to be displayed. It works for true
but not false. Since you expect an integer:
echo (int)$bool_val;
Solution 13 - Php
json_encode will do it out-of-the-box, but it's not pretty (indented, etc):
echo json_encode(array('whatever' => TRUE, 'somethingelse' => FALSE));
...gives...
{"whatever":true,"somethingelse":false}