Undefined index error PHP
Try: <?php if (isset($_POST[‘name’])) { $name = $_POST[‘name’]; } if (isset($_POST[‘price’])) { $price = $_POST[‘price’]; } if (isset($_POST[‘description’])) { $description = $_POST[‘description’]; } ?>
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Integer overflow in C: standards and compilers
Take a look at -ftrapv and -fwrapv: -ftrapv This option generates traps for signed overflow on addition, subtraction, multiplication operations. -fwrapv This option instructs the compiler to assume that signed arithmetic overflow of addition, subtraction and multiplication wraps around using twos-complement representation. This flag enables some optimizations and disables other. This option is enabled by … Read more
JSLint: was used before it was defined
From the documentation JSLint also recognizes a /*global */ directive that can indicate to JSLint that variables used in this file were defined in other files. The comment can contain a comma separated list of names. Each name can optionally be followed by a colon and either true or false, true indicating that the variable … Read more
Test if something is not undefined in JavaScript
response[0] is not defined, check if it is defined and then check for its property title. if(typeof response[0] !== ‘undefined’ && typeof response[0].title !== ‘undefined’){ //Do something }
Set a variable if undefined in JavaScript
Yes, it can do that, but strictly speaking that will assign the default value if the retrieved value is falsey, as opposed to truly undefined. It would therefore not only match undefined but also null, false, 0, NaN, “” (but not “0”). If you want to set to default only if the variable is strictly … Read more
Why is my JavaScript hoisted local variable returning undefined but the hoisted global variable is returning blank? [duplicate]
What is happening here is that you are accessing window.name. This is a predefined property on window, so your hoisted var name isn’t actually creating a new variable. There’s already one in the global scope with that name and by default, it has a blank string value. To observe the behavior you were expecting, you … Read more
C – is an indeterminate value indeterminable?
The fact that it is indeterminate not only means that it is unpredictable at the first read, it also means that it is not guaranteed to be stable. This means that reading the same uninitialized variable twice is not guaranteed to produce the same value. For this reason you cannot really “determine” that value by … Read more
Count of “Defined” Array Elements
In recent browser, you can use filter var size = arr.filter(function(value) { return value !== undefined }).length; console.log(size); Another method, if the browser supports indexOf for arrays: var size = arr.slice(0).sort().indexOf(undefined); If for absurd you have one-digit-only elements in the array, you could use that dirty trick: console.log(arr.join(“”).length); There are several methods you can use, … Read more
PHP Undefined index error $_FILES?
For uploading files, you must use the enctype in form tag. <form enctype=”multipart/form-data” action=’register.php’ method=’post’>
Notice: Undefined index: HTTP_REFERER
HTTP_REFERER is not guaranteed to be sent by the client: The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot … Read more