php remove duplicate except original - php

Question

this is my code
<?php
$string = 'this
this
good
good
hahah';
$rows = explode("\n",$string);
$unwanted = 'this|good';
$cleanArray= preg_grep("/$unwanted/i",$rows,PREG_GREP_INVERT);
$cleanString=implode("\n",$cleanArray);
print_r ( $cleanString );
?>
display
hahah
i want like this
this
good
hahah
i want to keep one...
please help me, thanks guys

Answer 1

This code resorts to checking each line to see if it matches your $unwanted string, but it also creates an array of strings it has already encountered so it checks if it has previously been encountered ( using in_array()). If it matches and has been encountered before it uses unset() in the original $rows to remove the line...
$string = 'this
this
good
good
hahah';
$rows = explode("\n",$string);
$unwanted = 'this|good';
$matched = [];
foreach ( $rows as $line => $row ) {
if ( preg_match("/$unwanted/i",$row, $matches)) {
if ( in_array(trim($matches[0]), $matched) === true ) {
unset($rows[$line]);
}
$matched[] = $matches[0];
}
}
$cleanString=implode("\n",$rows);
print_r ( $cleanString );

Answer 2

<?php
$string = 'this
this
good
yyyy
good
xxxx
hahah';
print_r(
implode("\n",
array_diff(array_unique(
array_map(function($v) { return trim($v);}, explode("\n",$string))
)
,array('xxxx', 'yyyy')))
);
?>
output:
this
good
hahah
Refer: https://ideone.com/Eo0MIM

Answer 3

You can use this simple code to get result:
$result = array_unique(explode("\n",str_replace(" ", "", $string)));
print_r ($result);
If you want more control over your data, use this code
$rows = explode("\n", $string);
$words = [];
foreach($rows as $row) {
$row = trim($row);
$words[$row] = true;
}
foreach($words as $word => $tmp) {
echo $word . "\n";
}

Answer 4

Here is one way you could do this:
$string = 'this
this
good
good
hahah';
preg_match_all('/([a-z])+/', $string, $matches);
$string = implode("\n",array_unique($matches[0]));
echo $string;

Answer 5

You can use php inbuilt array_unique function
<?php
$string = 'this
this
good
good
haha';
$rows = explode("\n",$string);
$cleanArray = array_unique($rows);
$cleanString=implode("\n",$cleanArray);
print_r ( $cleanString );
//result is this good haha