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@ 2015-05-04T09:44:56Z

<?php
   $valor_digital='-hola';                             
                                if (substr($valor_digital,0,1)=='-') $valor_digital=substr_replace($valor_digital,'',0,1);
echo $valor_digital;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
substr_replace: documentation ( source)

preferences:dark modelive preview

43.39 ms | 402 KiB | 5 Q