Check and replace text in a string from a text file - php

Question

I have this script that reads the last 100 lines from a text file, I explode out each line into 3 chunks were separated by a space. The third chunk of data I want to check to see if it contains a word or phrase from one of the lines in another text file filters.txt. If a match is found, then I want to replace that word or phrase with some formatting so it stands out. Below is what I have but it does not work, the code that checks against the filters has no effect.
Can anyone please show me how I should do this.
Thanks in advance.
Here is a line from sample.log...
12:12:46 18-10-18 #:10656200,1A,29D09 ,RTC NOT ALERT , ,CHEMIST WAREHOUSE , , ,910 David Low Way ,MARCOOLA ,S59K7 , , ,
In the filters.txt file will be lines such as...
RTC
RTC INJURIES
RTC NOT ALERT
RTC HIGH MECH
In above exmaple when I print out the data I want the 'RTC NOT ALERT' to be highlighted so it stands out. So in brief, for every line in sample.log I want to see if any of the filters appear in it, if so I want it to be highlighted on output. I do this by changing the font styling with css.
<?php
// OPEN LOG FILE FOR READING
$file = array_reverse( file( 'sample.log' ));
// OPEN FILTERS LIST
$filters = file( 'filters.txt' );
// START MAIN LOOP (SHOWS LAST X LINES FROM TEXT FILE)
$limit = 100;
for ($i = 0; $i < $limit; $i++ ){
$data = explode(' ', $file[$i],3);
// CHECK FOR FILTERS AND HIGHLIGHT IF MATCHED
foreach ( $filters as $filter ){
if (strpos($data[2], $filter) !== false) {
$data[2] = str_replace($filter,"<font
class=\"highlight\">$filter</font>",$data[2]);
}
}
// PRINT LIST
print "
<div class=\"code1a\">
<font class=\"time\">$data[0] $data[1]</font><br>
$data[2]
</div>
";
}
?>

Answer 1

Though you didn't give any example from sample.log and filters.txt, I think you need to trim each $filter because of line-break.
Try:
<?php
// OPEN LOG FILE FOR READING
$file = array_reverse( file( 'sample.log' ) );
// OPEN FILTERS LIST
$filters = file( 'filters.txt', FILE_SKIP_EMPTY_LINES | FILE_IGNORE_NEW_LINES );
// START MAIN LOOP (SHOWS LAST X LINES FROM TEXT FILE)
$limit = 100;
// BECAUSE $file STARTS WITH 0
$limit -= 1;
foreach ( $file as $line => $line_content ) {
if ( $line == $limit ) {
break;
}
$data = explode( ' ', $line_content, 3 );
$highlight = $data[ 2 ];
// CHECK FOR FILTERS AND HIGHLIGHT IF MATCHED
foreach ( $filters as $filter ) {
if ( strpos( $highlight, ',' . $filter . ' ,' ) !== false ) {
$highlight = str_replace( $filter, '<font class="highlight">' . $filter . '</font>', $highlight );
}
}
// PRINT LIST
echo '<div class="code1a">';
echo '<font class="time">', $data[ 0 ], ' ', $data[ 1 ], '</font>';
echo '<br />';
echo $highlight;
echo '</div>';
}