function adinj_inject_hook($content)
{
if (is_feed()) {
return $content;
}
$reason = adinj_ads_completely_disabled_from_page($content);
if ($reason !== false) {
return adinj($content, $reason);
}
$ops = adinj_options();
if ($ops['ad_insertion_mode'] == 'direct_dynamic') {
$showads = adinj_show_adverts();
if ($showads !== true) {
return adinj($content, "NOADS: ad blocked at run time reason={$showads}");
}
}
$ad_include = adinj_ad_code_include();
# Ad sandwich mode
if (is_page() || is_single()) {
if (stripos($content, "<!--adsandwich-->") !== false) {
return adinj($ad_include . adinj_ad_code_top() . $content . adinj_ad_code_bottom(), "Ads=adsandwich");
}
if (stripos($content, "<!--adfooter-->") !== false) {
return adinj($content . $ad_include . adinj_ad_code_bottom(), "Ads=adfooter");
}
}
# Insert top and bottom ads if necesary
$length = strlen($content);
if (is_page() || is_single()) {
if (adinj_do_rule_if($ops['top_ad_if_longer_than'], '<', $length)) {
$content = $ad_include . adinj_ad_code_top() . $content;
$ad_include = false;
}
if (adinj_do_rule_if($ops['bottom_ad_if_longer_than'], '<', $length)) {
$content = $content . adinj_ad_code_bottom();
}
}
$num_rand_ads_to_insert = adinj_num_rand_ads_to_insert($length);
if ($num_rand_ads_to_insert <= 0) {
return adinj($content, "all ads used up");
}
$ad = adinj_ad_code_random();
if (empty($ad)) {
return adinj($content, "no random ad defined");
}
if ($ad_include !== false) {
$content = $ad_include . $content;
}
$debug_on = $ops['debug_mode'];
if (!$debug_on) {
$debugtags = false;
}
$content_adfree_header = "";
$content_adfree_footer = "";
// TODO add docs explaining the significance of leaving blank lines
// before or after these tags
# 'Adsense Injection' tag compatibility
$split = adinj_split_by_tag($content, "<!--adsensestart-->", $debugtags);
if (count($split) == 2) {
$content_adfree_header = $split[0];
$content = $split[1];
}
# Use the same naming convention for the end tag
$split = adinj_split_by_tag($content, "<!--adsenseend-->", $debugtags);
if (count($split) == 2) {
$content = $split[0];
$content_adfree_footer = $split[1];
}
$split = adinj_split_by_tag($content, "<!--adstart-->", $debugtags);
if (count($split) == 2) {
$content_adfree_header = $split[0];
$content = $split[1];
}
$split = adinj_split_by_tag($content, "<!--adend-->", $debugtags);
if (count($split) == 2) {
$content = $split[0];
$content_adfree_footer = $split[1];
}
// TODO add note explaining that start tags are processed before the 'first
// paragraph ad
// Move onto random ad insertions
$paragraphmarker = "</p>";
if (stripos($content, $paragraphmarker) === false) {
return adinj($content, "no </p> tags");
}
if ($debug_on) {
$debug = "\nTags=" . htmlentities($debugtags);
}
// Generate a list of all potential injection points
if ($debug_on) {
$debug .= "\nPotential positions: ";
}
$potential_inj_positions = array();
$prevpos = -1;
while (($prevpos = stripos($content, $paragraphmarker, $prevpos + 1)) !== false) {
$potential_inj_positions[] = $prevpos + strlen($paragraphmarker);
if ($debug_on) {
$debug .= $prevpos . ", ";
}
}
if ($debug_on) {
$debug .= "\npotential_inj_positions:" . sizeof($potential_inj_positions);
}
if (sizeof($potential_inj_positions) == 0) {
return adinj($content, "Error: no potential inj positions");
}
$inj_positions = array();
if (adinj_ticked('first_paragraph_ad')) {
$inj_positions[] = array_shift($potential_inj_positions);
--$num_rand_ads_to_insert;
}
// Pick the correct number of random injection points
if (sizeof($potential_inj_positions) > 0 && $num_rand_ads_to_insert > 0) {
if (!adinj_ticked('multiple_ads_at_same_position')) {
// Each ad is inserted into a unique position
if (sizeof($potential_inj_positions) < $num_rand_ads_to_insert) {
$debug .= "\nnum_rand_ads_to_insert requested={$num_rand_ads_to_insert}. But restricted to " . sizeof($potential_inj_positions) . " due to limited injection points.";
$num_rand_ads_to_insert = sizeof($potential_inj_positions);
}
$rand_positions = array_rand(array_flip($potential_inj_positions), $num_rand_ads_to_insert);
if ($num_rand_ads_to_insert == 1) {
// Convert it back into an array
$inj_positions[] = $rand_positions;
} else {
$inj_positions = array_merge($inj_positions, $rand_positions);
}
foreach ($inj_positions as $pos) {
if ($debug_on) {
$debug = $pos . ", " . $debug;
}
}
} else {
// Multiple ads may be inserted at the same position
$injections = 0;
while ($injections++ < $num_rand_ads_to_insert) {
$rnd = array_rand($potential_inj_positions);
if ($debug_on) {
$debug = $potential_inj_positions[$rnd] . ", " . $debug;
}
$inj_positions[] = $potential_inj_positions[$rnd];
}
}
}
if (sizeof($inj_positions) == 0) {
return adinj($content_adfree_header . $content . $content_adfree_footer, "Error: No ad injection positions: " . $debug);
}
// Sort positions
sort($inj_positions);
// Insert ads in reverse order
global $adinj_total_rand_ads_used, $adinj_total_all_ads_used;
for ($adnum = sizeof($inj_positions) - 1; $adnum >= 0; $adnum--) {
$content = substr_replace($content, $ad, $inj_positions[$adnum], 0);
++$adinj_total_rand_ads_used;
++$adinj_total_all_ads_used;
}
return adinj($content_adfree_header . $content . $content_adfree_footer, "Ads injected: " . $debug);
}
function adinj_get_random_paragraphs($content, $length, $original_paragraph_positions, &$debug)
{
$ops = adinj_options();
$debug_on = adinj_debug_on();
$random_ad_paragraphs = array();
$random_start_paragraph = 0;
$random_end_paragraph = 0;
adinj_get_random_ad_start_end_paragraph($content, $original_paragraph_positions, $random_start_paragraph, $random_end_paragraph, $debug);
if ($debug_on) {
$debug .= "\n1st Injected random ads range starts at: {$random_start_paragraph}, and ends at: {$random_end_paragraph}";
}
$paracount = count($original_paragraph_positions);
$random_end_paragraph = min($random_end_paragraph, $paracount);
if (!adinj_ticked('rnd_allow_ads_on_last_paragraph')) {
if ($random_end_paragraph == $paracount) {
--$random_end_paragraph;
}
if ($random_end_paragraph == 0) {
if ($debug_on) {
$debug .= "\nNo random ads: no potential inj positions after removing last paragraph position";
}
return;
}
}
if ($random_start_paragraph <= 0 || $random_end_paragraph <= 0 || $random_end_paragraph - $random_start_paragraph < 0) {
if ($debug_on) {
$debug .= "\nWarning: No paragraphs: random_start_paragraph:{$random_start_paragraph} random_end_paragraph:{$random_end_paragraph}";
}
return array();
}
if ($debug_on) {
$debug .= "\n2nd Injected random ads range starts at: {$random_start_paragraph}, and ends at: {$random_end_paragraph}";
}
$potential_random_ad_paragraphs = range($random_start_paragraph, $random_end_paragraph);
if ($debug_on) {
$debug .= "\npotential_random_ad_paragraphs:" . sizeof($potential_random_ad_paragraphs);
}
if (sizeof($potential_random_ad_paragraphs) == 0) {
if ($debug_on) {
$debug .= "\nNo random ads: no potential inj positions found in content";
}
return array();
}
# Checks to see if we can inject random ads
$requested_num_rand_ads_to_insert = adinj_num_rand_ads_to_insert($length, $debug);
if ($debug_on) {
$debug .= "\nrequested_num_rand_ads_to_insert:{$requested_num_rand_ads_to_insert}";
}
if ($requested_num_rand_ads_to_insert <= 0) {
if ($debug_on) {
$debug .= "\nNo random ads enabled on this post";
}
return array();
}
$num_rand_ads_to_insert = $requested_num_rand_ads_to_insert;
# We have to put the first ad at the first position we already selected unless the first ad can start 'anywhere'
if ($ops['random_ads_start_mode'] != 'anywhere' && $ops['random_ads_start_mode'] != 'after') {
$random_ad_paragraphs[] = array_shift($potential_random_ad_paragraphs);
--$num_rand_ads_to_insert;
}
# Pick the correct number of random injection points
if (sizeof($potential_random_ad_paragraphs) > 0 && $num_rand_ads_to_insert > 0) {
if (!adinj_ticked('multiple_ads_at_same_position')) {
// Each ad is inserted into a unique position
if (sizeof($potential_random_ad_paragraphs) < $num_rand_ads_to_insert) {
$debug .= "\nNum random ads requested={$requested_num_rand_ads_to_insert}. But restricted to " . (sizeof($potential_random_ad_paragraphs) + sizeof($random_ad_paragraphs)) . " due to limited injection points.";
$num_rand_ads_to_insert = sizeof($potential_random_ad_paragraphs);
}
$rand_positions = array_rand(array_flip($potential_random_ad_paragraphs), $num_rand_ads_to_insert);
if ($num_rand_ads_to_insert == 1) {
// Add the single value to the array
$random_ad_paragraphs[] = $rand_positions;
} else {
// Merge the values with the array
$random_ad_paragraphs = array_merge($random_ad_paragraphs, $rand_positions);
}
} else {
// Multiple ads may be inserted at the same position
$injections = 0;
while ($injections++ < $num_rand_ads_to_insert) {
$rnd = array_rand($potential_random_ad_paragraphs);
$random_ad_paragraphs[] = $potential_random_ad_paragraphs[$rnd];
}
}
}
# Sort positions
sort($random_ad_paragraphs);
if ($debug_on) {
$injected_list = '';
foreach ($random_ad_paragraphs as $pos) {
$injected_list .= "{$pos} ";
}
$debug .= "\nInjected ads at: {$injected_list}";
}
return $random_ad_paragraphs;
}
