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What's the deal with a leading underscore in PHP class methods?

While looking over various PHP libraries I've noticed that a lot of people choose to prefix some class methods with a single underscore, such as ...
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How to get the first item from an associative PHP array?

... More information on the reset function: www.w3schools.com/php/func_array_reset.asp – Paul Chris Jones Dec 17 '19 at 12:38 ...
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How to sort an array of associative arrays by value of a given key in PHP?

... = $row['price']; } array_multisort($price, SORT_DESC, $inventory); As of PHP 5.5.0 you can use array_column() instead of that foreach: $price = array_column($inventory, 'price'); array_multisort($price, SORT_DESC, $inventory); ...
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PHP array_filter with arguments

... I am not a php savy, so maybe this is an obvious question, but how can you pass in an array to array_filter and still make it work? the documentation never talks about this, except for someone's comment. – Nicola P...
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How do I add a simple jQuery script to WordPress?

... and its very frustrating. I've got as far as loading jQuery in functions.php file, but all of the guides out there are crappy because they assume you already have a ton of WordPress experience. For instance, they say that now that I'm loading jQuery through the functions.php file, now all I hav...
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How do I convert a string to a number in PHP?

...Script we can use Number() , but is there any similar method available in PHP? 30 Answers ...
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How to round up a number to nearest 10?

How can we round off a number to the nearest 10 in php? 16 Answers 16 ...
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Can an Option in a Select tag carry multiple values?

... options in a HTML form: (the data will be collected and processed using PHP) 15 Answers ...
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How to get last key in an array?

... PHP's built-in functions were built by extreme nerds. Do not try to recreate those functions. The odds are that you make something far slower than the original. Unless you are some sort of evil wizard, of couse. ...
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PHP - Merging two arrays into one array (also Remove Duplicates)

... array_unique(array_merge($array1,$array2), SORT_REGULAR); http://se2.php.net/manual/en/function.array-unique.php share | improve this answer | follow | ...