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What does $$ (dollar dollar or double dollar) mean in PHP?
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It's a variable's variable.
<?php
$a = 'hello';
$$a = 'world'; // now makes $hello a variable that holds 'world'
echo "$a ${$a}"; // "hello world"
echo "$a $hello"; // "hello world"
?>
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curl: (60) SSL certificate problem: unable to get local issuer certificate
...cert.pem from https://curl.haxx.se/ca/cacert.pem
Add the following line to php.ini: (if this is shared hosting and you don't have access to php.ini then you could add this to .user.ini in public_html).
curl.cainfo="/path/to/downloaded/cacert.pem"
Make sure you enclose the path within double quota...
MySQL ON DUPLICATE KEY - last insert id?
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It is said that php function mysql_insert_id() returns correct value in both cases: php.net/manual/en/function.mysql-insert-id.php#59718.
– jayarjo
Jun 10 '10 at 13:09
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How to save a PNG image server-side, from a base64 data string
...rings that this tool generates, into actual PNG files on the server, using PHP.
15 Answers
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PHP: Move associative array element to beginning of array
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There's a function in the comments of the PHP manual for array_unshift which can be used to add an element, with key, to the beginning of an array:
function array_unshift_assoc(&$arr, $key, $val)
{
$arr = array_reverse($arr, true);
$arr[$key] = $val;
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Check if URL has certain string with PHP
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worked for me with php
if(strpos($_SERVER['REQUEST_URI'], 'shop.php') !== false){
echo 'url contains shop';
}
share
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improve this answer
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PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?
I did a lot of searching and also read the PHP $_SERVER docs . Do I have this right regarding which to use for my PHP scripts for simple link definitions used throughout my site?
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离开1号店 于刚再创业钟情“互联网+” - 资讯 - 清泛网 - 专注C/C++及内核技术
...但仍被业内解读为，沃尔玛将会在涉及1号店战略定位的问题上采取重要改变。
近期，沃尔玛发给记者的一份声明中显示：“1号店创始人兼董事长于刚以及联合创始人兼首席执行官刘峻岭决定离开1号店，去开创他们下一个事业...
Read each line of txt file to new array element
... file should either be stored on memory cache, or even in a database. Even PHP stores the content of parsed files. I mean, we're far from PHP 4.3
– Yanick Rochon
Jul 16 at 2:32
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What is the point of interfaces in PHP?
... concept of an 'interface' from the concrete interfaces in a language like PHP? Any function, for instance, has an "interface" which defines how you use it and hides its implementation. So that kind of "contractual" interface doesn't require a special language feature. Therefore the language feature...