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In what cases will HTTP_REFERER be empty

...a different https URL. has security software installed (antivirus/firewall/etc) which strips the referrer from all requests. is behind a proxy which strips the referrer from all requests. visited the site programmatically (like, curl) without setting the referrer header (searchbots!). ...
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What's the difference between a continuation and a callback?

...* y; } Now if every operation (including addition, multiplication, etc.) were written in the form of functions then we would have: console.log(pythagoras(3, 4)); function pythagoras(x, y) { return add(square(x), square(y)); } function square(x) { return multiply(x, x); ...
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How do I find which program is using port 80 in Windows? [duplicate]

...80", so besides port 80, it will also matches programs on port 8009, 8080, etc. – Benny Neugebauer Feb 4 '18 at 16:15 add a comment  |  ...
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Converting string to Date and DateTime

...ad of crashing, you will get an exception, which you can catch, propagate, etc. $dateDE has the wrong format, it should be "16.10.2013"; share | improve this answer | follow...
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How do I insert NULL values using PDO?

...nstance $query = $db->prepare($sql); //Works with INT, FLOAT, ETC. $query->bindValue(':productId', !empty($productId) ? $productId : NULL, PDO::PARAM_INT); //Works with strings. $query->bindValue(':productName',!empty($productName) ? $productName : NULL, PDO::PA...
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What does the NS prefix mean?

...oprietary term for the OpenStep framework, NeXTSTEP): NSString, NSArray, etc. Foundation Kit, or more commonly simply Foundation, first appeared in OpenStep. On Mac OS X, it is based on Core Foundation. Foundation is a generic object-oriented library providing string and value manipulat...
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Stop an input field in a form from being submitted

...for my inserted fields to be usable so that the user can change checkboxes etc. and then submit them to my javascript. – Acorn Jun 9 '10 at 17:05 3 ...
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How to terminate the script in JavaScript?

...opagation(); // e.preventDefault(); // Stop for the form controls, etc., too? } for (i=0; i < handlers.length; i++) { window.addEventListener(handlers[i], function (e) {stopPropagation(e);}, true); } if (window.stop) { window.stop(); } throw ''; }...
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How to use a variable inside a regular expression?

...(TEXTO) + r"\b(?!\w)" if re.search(my_regex, subject, re.IGNORECASE): etc. Note the use of re.escape so that if your text has special characters, they won't be interpreted as such. share | im...
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What is the best way to determine the number of days in a month with JavaScript?

...function daysInMonth (month, year) { // Use 1 for January, 2 for February, etc. return new Date(year, month, 0).getDate(); } console.log(daysInMonth(2, 1999)); // February in a non-leap year. console.log(daysInMonth(2, 2000)); // February in a leap year. Day 0 is the last day in the p...