Very often when I review other peoples PHP code I come across an old problem: generating a list of comma separated values from a list of things. This happens often when you want to, say, write an SQL query with a WHERE field IN (a,b,c,…,x) and you have an array with a, b, etc.
Another example is when you want to create an include path by concatenating a list of directories with the PATH_SEPARATOR. Yet another example is when you want to build a path concatenating them with the DIRECTORY_SEPARATOR.
The usual code to accomplish looks something like this:
<?php
// loop through list an generate string
$line = ”;
foreach( $list as $el ) {
$line .= $el . ‘,’;
}
// loop through list an generate string
$line = ”;
foreach( $list as $el ) {
$line .= $el . ‘,’;
}
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