Solved: php implode / explore

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zattz

php implode / explore

I was wondering if somebody could help me with some code. I am a php newbie.

I keep getting the following error in my apache logs: "PHP Warning: implode(): Argument must be an array". I presume it is because the array is empty or does not have enough content. Can somebody give some advice on how to get rid of the warnings. It seems to function fine.

$sentences = $content->getSentences();

$chunks = array_chunk($sentences, count($sentences) / 2);
$sections = array_chunk($chunks[0], count($chunks[0]) / 7);

$main_content = implode($chunks[1]);

$section1  = implode($sections[0]);
$section2  = implode($sections[1]);
$section3  = implode($sections[2]);
$section4  = implode($sections[3]);
$section5  = implode($sections[4]);
$section6  = implode($sections[5]);
$section7  = implode($sections[6]);

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gr8gonzo🇺🇸

Implode is a way to join the elements of an array together with some kind of delimiter. For example:

$x = array("The","quick","brown","fox");

echo implode("#",$x); // Results in "The#quick#brown#fox"
echo implode(" ",$x); // Results in "The quick brown fox"

gr8gonzo🇺🇸

And just for the sake of completeness, explode() does the opposite. It takes a string and converts it into an array by using a delimiter. Like this:

$string = "The quick brown fox";
$array = explode(" ",$string); // Results in Array("The","quick","brown","fox")

The implode/explode functions are pretty useful for any kind of delimited strings or to find the individual lines in a piece of content (explode() the whole contents by the newline \n character)

zattz

ASKER

I know the script is supposed to do. I just don't like the warning messages flooding my log files.

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gr8gonzo🇺🇸

Yes, but it's because you don't have a delimiter as your first parameter. I was trying to give you the proper usage. If you don't want a delimiter, then pass an empty string. For example:

$main_content = implode("",$chunks[1]);

Ray Paseur🇺🇸

The difference is stylistic, not substantive but I would code it this way:

$main_content = implode(NULL,$chunks[1]);

Before your script uses a function that requires an array for input you can test the input data to see if it is an array. (#protip: All PHP functions are documented in the PHP.net web site -- required reading if you're going to try to write programs in PHP).
http://php.net/manual/en/function.is-array.php

A really good book to help you get a jump-start in PHP...
http://www.sitepoint.com/books/phpmysql5/

zattz

ASKER

Using $main_content = implode("",$chunks[1]); I now get

PHP Warning: implode(): Argument must be an array

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zattz

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Sorry I meant to say the error is now "PHP Warning: implode(): Invalid arguments passed"

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gr8gonzo🇺🇸

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zattz

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I got it to work by checking for null...

Ray Paseur🇺🇸

I got it to work by checking for null...

The correct way would be to check to see if the data element is an array. Many PHP functions return an array on success or FALSE on failure. A test for NULL will fail both of those conditions. Use this function instead (see comment at ID: 38192318 for the explanation).
http://php.net/manual/en/function.is-array.php

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