i have a variable like the following and i want a function to only keep the first 20 lines, so it will strips any additional \n lines more than 20.
<?php
$mytext="Line1
Line2
Line3
....."
keeptwentyline($mytext);
?>
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2 Answers
I suppose a (maybe a bit dumb ^^ ) solution would be to :
explodethe string into an array of lines- keep only the X first lines, using, for instance,
array_slice implodethose back into a string.
Something like that would correspond to this idea :
var_dump(keepXlines($mytext, 5));
function keepXLines($str, $num=10) {
$lines = explode("\n", $str);
$firsts = array_slice($lines, 0, $num);
return implode("\n", $firsts);
}
Note : I passed the number of lines as a parameter -- that way, the function can be used elsewhere ;-)
And if the parameter is not given, it takes the default value : 10
But there might be some clever way ^^
(that one will probably need qiute some memory, to copy the string into an array, extract the first lines, re-create a string...)
3 Comments
Andy
that's the best I could come up with :)
Pascal MARTIN
I see I'm not the only one who got that idea ^^ (Even though I would be curious about other ways, actually ^^ )
Pascal MARTIN
Indeed :-) what I meant was more like "without explode/implode" -- ho, I see you've edited your answer, since ;-)
function keeptwentyline($string)
{
$string = explode("\n", $string);
array_splice($string, 20);
return implode("\n", $string);
}
Or (probably faster)
function keepLines($string, $lines = 20)
{
for ($offset = 0, $x = 0; $x < $lines; $x++) {
$offset = strpos($string, "\n", $offset) + 1;
}
return substr($string, 0, $offset);
}
