---
title: "Funciones String"
date: 2008-05-12
author: "Alex Borrás"
source: https://alexborras.com/funciones-string/
site: "El Blog de Alex Borrás"
---
# Funciones String
Funciones de tratamiento de String en PHP:
**Pasar String a minúsculas**
```
$str = "Hola esto es UNion";
$str = strtolower($str);
```
strong>Buscar un String dentro de otro
Distinguiendo Mayúsculas de minúsculas
```
$str = "Hola esto es UNION";
if (strpos($str,"UNION") > 0) ...
```
Sin distinguir (solo en PHP5):
```
$str = "Hola esto es UnIoN";
if (stripos($str,"UNION")
...
```
### Obtener la posición de un String dentro de otro
```
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// Note our use of ===. Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
echo "The string '$findme' was not found in the string '$mystring'";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
}
// We can search for the character, ignoring anything before the offset
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
?>
```