How to check if text contains specific characters before printing (xpath)? - php

Question

So right now I have this code, which works great:
This takes anything that's in the xpath and print.
<?php
$parent_title = get_the_title( $post->post_parent );
$html_string = file_get_contents('http://www.weburladresshere.com');
$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML($html_string);
libxml_clear_errors();
$xpath = new DOMXpath($dom);
$values = array();
$row = $xpath->query('myquery');
foreach($row as $value) {
print($value->nodeValue);
}
?>
I need to insert two things into the code (if possible):
To check if the content is longer than x characters, then don't print.
To check if the content contains http in the content, then don't print.
If both of the above are negative - take it and print it.
If one of them is positive - skip, and then check the secondquery on the same page:
$row = $xpath->query('secondquery');
If this also contains one of the above, then check the thirdquery (from the same page) and so on.
Until it matches.
Any help would be appreciated.

Answer 1

From what I understand from the question you want a way to continue to run queries on the DOMDocument and evaluate the following conditions.
If the string length of the nodeValue is below a threshold
If the string of nodeValue does not contain "http"
Logic conditions:
IF both of those above are true then echo to the screen
IF one of those are false then run the next subquery
Below is the code which uses 500 characters as the length. My example has 3 entries which have the following character counts: 294, 98, and 1305.
<?php
/**
* #param $xpath
* #param $xPathQueries
* #param int $iteration
*/
function doXpathQuery($xpath, $xPathQueries, $iteration = 0)
{
// Validate there's no more subquery to go through
if (!isset($xPathQueries[$iteration])) {
return;
}
$runNextIteration = false;
// Run the XPATH subquery
$rows = $xpath->query($xPathQueries[$iteration]);
foreach ($rows as $row) {
$value = trim($row->nodeValue);
$smallerThanLength = (strlen($value) < 500);
// Case insensitive search, might use "http://" for less false positives
$noHttpFound = (stristr($value, 'http') === FALSE);
// Is it smaller than length, and no http found?
if($smallerThanLength && $noHttpFound) {
echo $value;
} else {
// One of them isn't true so run the next query
$runNextIteration = true;
}
}
// Should we do the next query?
if ($runNextIteration) {
$iteration++;
doXpathQuery($xpath, $xPathQueries, $iteration);
}
}
// Commented out this next line because I'm not sure what it does in this context
// $parent_title = get_the_title( $post->post_parent );
// Get all the contents for the URL
$html_string = file_get_contents('https://theeasyapi.com');
$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML($html_string);
libxml_clear_errors();
$xpath = new DOMXpath($dom);
// Container that will hold all the rows that match the criteria
$values = [];
// An array containing all of the XPATH queries you want to run
$xPathQueries = ['/html/body/div/section', '/html/body/div'];
doXpathQuery($xpath, $xPathQueries);
This will run all of the queries put in $xPathQueries as long as the query produces a value where the string length is above 500 or 'http' is found.