I am new to PHP. I am implementing a script and I am puzzled by the following:
$local_rate_filename = $_SERVER['DOCUMENT_ROOT']."/ghjr324l.txt";
$local_rates_file_exists = file_exists($local_rate_filename);
echo $local_rates_file_exists."<br>";
This piece of code displays an empty string, rather than 0 or 1 (or true or false). Why? Documentation seems to indicate that a boolean value is always 0 or 1. What is the logic behind this?
<? and <?= are called short open tags, and are not always enabled (see the short_open_tag directive) with PHP 5.3 or below (but since PHP 5.4.0, <?= is always available).
Actually, in the php.ini-production file provided with PHP 5.3.0, they are disabled by default:
$ grep 'short_open' php.ini-production
; short_open_tag
short_open_tag = Off
So, using them in an application you want to distribute might not be a good idea: your application will not work if they are not enabled.
<?php, on the other side, cannot be disabled -- so, it's safest to use this one, even if it is longer to write.
Except the fact that short open tags are not necessarily enabled, I don't think there is much of a difference.
On user.php page you need to do :-
function init() {
$arr = array(
array(
"region" => "valore",
"price" => "valore2"
),
array(
"region" => "valore",
"price" => "valore2"
),
array(
"region" => "valore",
"price" => "valore2"
)
);
echo json_encode($arr);
}
You are not appending the variable to the string properly. Also you have to enclose nextpage.php?file=variable within quotes. But you are closing it before the variable name.
<a href="nextpage.php?file=".'$myvar'.>
^
So try with
echo('<tr> <td> <a href="nextpage.php?file='.$myvar.'"> download now </a> </td> </tr>');
<?php if (isset($g1) && $g1!='') { ?>
<a href="img/g1.png" class="lightbox" rel="tooltip" data-original-title="<?php print $g1; ?>" data-plugin-options='{"type":"image"}'>
<img class="img-responsive img-rounded wbdr4" src="img/g1.png">
</a>
<?php } ?>
Be careful when you convert back and forth with boolean, the manual says:
So you need to do a: