готово
<section>
<div data-value="1">111111</div>
<div data-value="2">222222</div>
<div data-value="3">333333</div>
<div data-value="4">444444</div>
<div data-value="5">555555</div>
</section>
<script>
document.querySelector('section').addEventListener('click', e => {
const o = e.target.closest('[data-value]')
if (!o) return
document.getElementById("content").value = (o.dataset.value)
})
</script>
<?php
//$test = '<div id="content"></div>';
echo '<input type=text id="content" value="111">';
?>