Supposing I have:
$yeah='71263andsomemore632';
How may I get two variables like this:
$intAtBeginning=71263;
$theRest='andsomemore632';
I really don't know how to do this, since both integers might have a different length. I promise I will research on whatever you help me with, to understand it and sleep happy today ;)
Thanks.
An easy way would be to use sscanf
list($intAtBeginning, $theRest) = sscanf($yeah, '%d%s');
echo $intAtBeginning.'<br>'.$theRest;
Related
For example
$var = '10/2';
Is there a way for me to output the value 5 from that easily?
So something like this:
$foo = ($var) + 5;
I want $foo to have a value of 10?
Currently, the best way I know is to explode $var and then divide $var[0] by $var[1]. Is there a quicker way?
Another way of asking; Is there a way to tell the system to treat '10/2' as an equation instead of a string?
Could be you can use a solution like this
$foo = eval('return '.$var +5 .';');
print $foo;
eval require a line of code .. so you could build a valid code line
eval() to either assign in place or return:
eval("\$foo = ($var) + 5;");
$foo = eval("return ($var) + 5;");
First things first, EVAL IS HAZARDOUS AND SHOULD NEVER BE USED UNLESS YOU KNOW WHAT YOU'RE DOING! As an addendum to this, you don't know what you're doing. No matter how experienced you are as a programmer, when it comes to eval just assume you don't know what you're doing. Believe me, in the long run your sanity will thank you.
As for your problem, you're basically asking how to write an equation parser. Writing a full blown one that can handle all cases of valid input (and reliably identify invalid input) is a much bigger job than you might at first think, so if you really do need to parse string equations it may be better to look for a library that will do it for you because the chances are whoever wrote the library thought of a lot of stuff that you didn't, such as handling operator precedence and how parenthesis can modify it, how to pass strings in scientific notation, etc.
One of your comments suggests using PHP Math Parser. I've never personally used it, but I know the author by reputation well enough to believe it's a reliable library.
If your use case is always going to be as simple as your example then you can simply split the string and process the resulting fragments.
$parts = explode ("/", $var);
$foo = $parts[0] / $parts[1];
I'm looking for a bit of assistance in generating a random string of numbers that is 4 digits long. To better explain my situation, here is a snippet of PHP code where I need the random numbers inserted (for those wondering about the $ssh->exec I'm using phpseclib).
echo $ssh->exec("touch $username-$port.txt");
The above $port variable is where I'd like PHP to generate a random 4 digit number (preferably between 5000-5999).
After looking at the documentation on W3Schools, it looks like they recommend using the following to generate a random number between defined limits, like so:
echo(rand(10,100));
This works standalone, but the problem with that is it requires an echo and I'm already performing an echo $ssh->exect with my above PHP code. So I'm not quite sure how I would implement an "echo inside an echo" if that makes sense.
If anyone would be willing to help me out with this, it would be greatly appreciated.
You can use a pre-defined variable such as:
$port = rand(5000,5999);
that will then populate through your exec provided you keep it encapsulated inside double quotes. Otherwise, you will need to concatenate.
Is there any fast (regex-based?) method to replace all smileys in a text, each by an unique corresponding identifier? For example, the first occurrence of :) should be replaced by smiley1, the :)) by smiley2 and another occurrence of :) by smiley1 again? Furthermore, the identifyier should be the same using different text for input
Any potential combination of the typical symbols (<5 chars?) such as :;-()&%}{[]D<>30_o should be recognizable.
Can this be done without a generating a large array of all combinations? In case, how?
Are you looking for preg_replace_callback()? You can even use closures in php 5.3. I am not clear on what the objective is, so at this point this is the best I can provide, if you can clarify, then maybe I can see what I can come up with for sample code.
edit, here's an example from the PHP manual. Doesn't help in this case specifically, but if you just change the regex, the function and the string (basically everything, lol), then it will do the job:
<?php
echo preg_replace_callback('/-([a-z])/', function ($match) {
return strtoupper($match[1]);
}, 'hello-world');
// outputs helloWorld
?>
I don't understand why you can't do:
str_replace(":))","<img src=\"smiley1.jpg\">",$STRING)
str_replace(":)","<img src=\"smiley2.jpg\">",$STRING)
etc... seems to be the most simple solution and logical
Obviously, it cannot be done by using such a str_replace. How would you fetch a ":)))" or maybe a "-.-" which is also not present in your list? Enumerating all potential smileys is a hard task, resulting in n!/(n-k)! candidates. Here, in the example provided above n=18 and k=5...
Thus, I'm asking for a way to use a regex - but I don't how to replace each combination of chars which is intended to represent a smiley each time by the same text.
Idea: is it possible to use a callback function in combination with a hash?
Yeah, Tim! That is exactely what came into my mind when writing the last post. So the solution is
<?php
echo preg_replace_callback("/([\)\(\[\]<>#-\.:;*+{}]{2,9})/", function ($match) {
return " ".md5($match[1])." ";
}, ':::-) :-)) nope (yeah) cool:) }:)');
?>
Thanks!
i have the following code snippet, in an appliation working with Zend Framework. I know what Zend Date does.. thats not the problem.
But the coder simply calls "$date" , and i dont know if this does something?
$date = new Zend_Date(time());
$date->addDay(1);
$date;
// save date, or do something else
...
I can't imagine a situation where simply stating a variable, whether it be an object, string, or otherwise, would perform some kind of action. It might just be a mistake.
As far as I can tell, it does nothing except using up some CPU cycles.
Maybe it had other use before, like echo $date;. Just writing a variable does absolutely nothing.
It adds a day to $date. Where is the confusion? The 3rd line does nothing.
I am new to programming and learning with Wordpress.
the_title(); //outputs the title of the page
I want to capture the title of the page into a string variable so I can manipulate it with strtolower and str_replace functions.
The only way I have gotten it to work is with output buffering.
ob_start();
the_title();
$result = ob_get_clean();
echo str_replace(" ","-",strtolower($result));
/*there has got to be an easier way....
i dont fully understand why */
str_replace(" ","-",strtolower(the_title()));
What am I doing wrong?
If what you really are looking for is the wp_title function, the 2nd argument it takes is a boolean on whether or not it should display it or return it. Pass it false so it will return it to the var, then you can do this:
$mytitle = wp_title(null, false);
Otherwise, your only option is to find the function you're looking for and modify the source code.
There is no easier way. Your function does not return the string, it prints it, therefore you will have to use output buffering if you want to capture the output.
It's the difference between f1() and f2() in the following example.
// Returns a string, prints nothing.
function f1() {
return "String";
}
// Prints a string, returns nothing.
function f2() {
echo "String";
}
Wordpress is a HORRIBLE app to learn how to program from. It uses these global functions that "just work" but they do very specific tasks "inside 'The Loop'". As I say, this is a horrible example of what good code should be.
Thankfully (for you) there are other functions that just return the part you're looking for. Rather than me just writing what you need, you can read a full listing here. Take care that you note down which must be within the mythical Loop and which you can use anywhere.
As it happens there are even more ways to get the title, but I was really imagining for this example you would do something like:
$this_post = get_post($post); // I *think* $post is the post ID inside the loop though I could be wrong
echo $this_post->post_title;
But as another poster (correctly) says you can use a fairly simple wp_title() function to grab the current loop title.
This brings me back to perhaps wanting to explain why learning programming from Wordpress is a bad idea. They have so many damned way of doing the same damned thing that it's almost impossible to keep on top of things.
A blog is a really simple set of data (even moreso in WP's case because it isn't fully normalised) but rather than just having one way to output a title <?php echo $post->title; ?> you have umpteen ways, all doing subtly different things.
If you really want to learn how to program (instead of hacking your way around the crap that is the WP internals), creating a simple blog engine is fairly quick and fun... It's certainly how a lot of people get into a new language or framework.
And if you really want to have fun, have a look at Django.
Enough of the Wordpress rant. If you're fighting something like this in the future that doesn't have 100 ways of doing it, I really wouldn't recommend output-buffer-capturing. It uses up a whole buttload of resources for something relatively simple.
The easiest way can be as simple as just taking the source for the original function, sticking it in a new function and replacing the echo with return.
Just note there may be some database connectivity to handle that returning prematurely may break... So if the echo isn't the last statement, instead of returning right there, store the string as a variable and return at the end of the function.
just figured Id share my final solution with you guys.
This was to give my body tags unique id's in wordpress.*/
$title =wp_title(null,false);
echo strtolower(str_replace(' ','-',ltrim($title)));
//without the ltrim() 2 dashes are created before the title.
Almost every 'the_*' function in Wordpress has a 'get_the_*' counterpart. So, you just have to use
echo str_replace(" ","-",get_the_title());
And it's going to work like a charm. there's also get_the_excerpt(), get_the_content() and the_permalink() which somehow breaks the naming convention (God knows how many times I've written "get_the_permalink()" and got frustrated on why it didn't work)
Cheers!