Get PHP text string - substr

You can do it by combining substrwith strpos, or by exploding with.

<?php

$cadena='archivo.php';

// opcion 1

$cadena_cortada = substr($cadena,0, strpos($cadena,'.'));

print_r('<br>opción 1 "'.$cadena_cortada.'"');


// opcion 2

$cadena_arr = explode('.',$cadena);

print_r('<br>opción 2 "'.$cadena_arr[0].'"');

Option 1 is closer to what you're trying to do, but if you pass it a character that isn't in the string, the result will be an empty string.

With the always option explodeit will give you something back.

Now, if you want it to return the string from the beginning to the last occurrence of a character, there you have to start putting checks, for example using strposto verify that the character exists, or exploiting and verifying the length of the resulting array. Let's say for example your string is archivo.con.datos.phpand you want justarchivo.con.datos

$cadena_arr2 = explode('.','archivo.con.datos.php');
$elementos = count($cadena_arr2);
print_r('<br>La cadena explotada tiene '.$elementos.' elementos');
if($elementos>1) {
    // quitamos el último elemento  
    array_pop($cadena_arr2);    
}
print_r('<br>opción 3 "'.implode('.',$cadena_arr2).'"');

substr()it only allows you to start from the indicated position and continue the number of characters that you indicate.

Use explode()

$string = "cadena.php";
$resultado = explode(".", $string);

With substr()you can't tell the character you want to end on, that's what explode().

You can use strtok() , which splits a string into smaller strings and returns it to you as a string .

echo strtok('cadena.php', '.'); // cadena