<?php
$content = [
    "Some Text",
    "Again, Some Text",
    "No, Not Again"
];
$title = "example";

$cc = [];
foreach ($content as $c) {
   $ww = mb_strpos($c, 'Some Text');
    if ($ww != true) {
        $cc[] = $c;
    }
}
$array = ["title" => $title, "content" => $cc];

$json = json_encode($array);

echo $json;