Is that really true that i can use $_ as a dummy variable in foreach loop if there is no need for $value in foreach($array as $key => $value)? I could not find any useful information that proves this except PHP syntax formatting. There’s a special case for foreach loops when the value is not used ins…
Tag: loops
Double-Elimination Tournament Schedule
I’m trying to create some logic to generate a schedule of events in a double-elimination tournament bracket. Here is an example 8-team bracket: The numbers represent indices in an array of matches, which is the desired output. For example, index 0 will represent Team 1 vs. Team 8 (using a seeded system)…
Access, transpose, and join data from a .csv file
I have a CSV File which is laid out as so: My code: This produces three strings, which are needed to plot a graph. However it is likely that I will be adding more columns to the csv file, so I need a way of looping around to avoid having to manually add new lines each time. I cannot seem
Removing last comma in array when looping without turning it into a string
I have a set of tags that I stored in the database separated by spaces as a string. When I echo them out with PHP, I explode them and loop through them with a for loop. My code looks something like this: So far I’ve only seen posts with answers to use implode, but if I use implode, I wouldn’t
Insert elements from one array (one-at-a-time) after every second element of another array (un-even zippering)
What would be an elegant way to merge two arrays, such that the resulting array has two items from the first array followed by a single item from the second array, repeating in this fashion? Desired result: I’m trying to do it using a for loop with multiple counters, but I don’t know that the arra…
Using fopen and str_replace to auto fill a select option
I have this file ‘gardens.php’, which pulls data from a table called ‘generalinfo’ and I use fopen to send that data to a file called ‘index.html’. Here is the issue, only one option is filled. I have a demo running here Garden Demo <– this is a new updated page an…
Loop through all months in a date range?
If I have a start date (say 2009-02-01) and an end date (say 2010-01-01), how can I create a loop to go through all the dates (months) in the range? Answer Try Mind the note http://php.net/manual/de/datetime.formats.relative.php Relative month values are calculated based on the length of months that they pass…
PHP How to determine the first and last iteration in a foreach loop?
The question is simple. I have a foreach loop in my code: In this loop, I want to react differently when we are in first or last iteration. How to do this? Answer You could use a counter:
How to find the foreach index?
Is it possible to find the foreach index? in a for loop as follows: $i will give you the index. Do I have to use the for loop or is there some way to get the index in the foreach loop? Answer $key is the index of each $array element