我正在开发一个新闻网站，我想限制$ row ['text']行中的角色数量，但我不能。我也尝试实现此解决方案Limiting the output of PHP's echo to 200 characters，但在我的代码中不起作用。还可以帮我吗？谢谢。
在此代码中，我可以从另一个页面正常工作。
<div class="col-sm-12" id="texto_urgeirica"><?php echo substr ($row['texto'], 0, 2);?></div>
我遇到的问题是此页代码的一部分。
<?php
if(mysqli_num_rows($result) > 0){
while($row = mysqli_fetch_array($result)){
echo "<div class='container' id='fadein2'>";
echo "<div class='row'>";
echo "<div class='col-sm-3'>";
echo "<a href='admin_destaques_noticia.php?id={$row['id']}'><img src='upload/destaques/{$row['image']}' id='imagem' class='imagem img-fluid'></a>";
echo "</div>";
echo "<div class='col-sm-9'>";
echo "<a href='admin_destaques_noticia.php?id={$row['id']}' id='url_sem_linha'><p class='destaques_lista'>{$row['titulo']}</p></a>";
echo "<a href='admin_destaques_noticia.php?id={$row['id']}' id='url_sem_linha'><p class='destaques_lista'>substr ({$row['texto'],0,20});</p></a>";
echo "<a href='admin_destaques_noticia.php?id={$row['id']}' id='url_sem_linha'><p class='ler_noticia'>Clique para ler a notícia</p></a>";
echo "<p></p>";
echo "</div>";
echo "<div class='col-sm-6' align='right'><a href='admin_destaques_editar.php?update_id={$row['id']}' class='btn btn-warning'>Editar</a></div>";
echo "<div class='col-sm-6'><a href='?delete_id={$row['id']}' class='btn btn-danger'>Eliminar</a></div>";
echo "</div>";
echo "<div class='linha_paginas'></div>";
echo "</div>";
echo "<p></p>";
}
} else{
echo"<h2>Não existe</h2>";
}
?>