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<?php //Enter your code here, enjoy! $nombre = "https://es.stackoverflow.com/questions/191277/a%c3%b1adir-texto-en-medio-de-strings-php/191279#191279/img.jpg"; $ext = explode('.', $nombre); $ext = end($ext); $nombre = str_replace(".".$ext, "-150x150.".$ext, $nombre); echo $nombre;
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