CorujaStringManipulation.class.php

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<?php
class CorujaStringManipulation
{

        public static function strToBool( $strText )
        {
                if(!is_string($strText))
                {
                        throw new InvalidArgumentException("Invalid argument [ ". var_export($strText) ." ]. It should be string");
                }

                $strText = strtolower( $strText );
                if ( $strText === "false" || $strText === "" || $strText === "0" )
                {
                        return( false );
                }
                return( true );
        }

        public static function forceInt( $strText )
        {
                if(!is_string($strText))
                {
                        throw new InvalidArgumentException("Invalid argument [ ". var_export($strText) ." ]. It should be string");
                }

                $arrNum = Array( "0","1","2","3","4","5","6","7","8","9");
                $strResult = "";
                for( $i = 0; $i < strlen( $strText ); ++$i )
                {
                        $charLetra = $strText[$i];
                        if( $i == 0 && $charLetra == "-" )
                        {
                                $strResult .= $charLetra;
                        }
                        if( in_array($charLetra,$arrNum))
                        {
                                $strResult .= $charLetra;
                        }
                }
                return $strResult += 0;
        }

        public static function camelCaseToUnderlineCase( $strText )
        {
                if(!is_string($strText))
                {
                        throw new InvalidArgumentException("Invalid argument [ ". var_export($strText) ." ]. It should be string");
                }

                $arrFind = Array( "A" , "B" , "C" , "D" , "E" , "F" , "G" , "H" , "I" , "J" , "K" , "L" , "M" , "N" , "O" ,
                                          "P" , "Q" , "R" , "S" , "T" , "U" , "V" , "X" , "Z" , "W" , "Y"       );

                $arrReplace = Array( "_A" , "_B" , "_C" , "_D" , "_E" , "_F" , "_G" , "_H" , "_I" , "_J" , "_K" , "_L" , "_M" ,
                                          "_N" , "_O" , "_P" , "_Q" , "_R" , "_S" , "_T" , "_U" , "_V" , "_X" , "_Z" , "_W" , "_Y"      );

                if( strlen( $strText ) > 0 )
                {
                        $strText[0] = strtolower($strText[0]);
                }

                return strtoupper( str_replace( $arrFind , $arrReplace , $strText ) );
        }

        public static function retab( $strText , $intDeeper )
        {
                $arrText = explode( "\n" , $strText );
                foreach( $arrText as $intKey => $strTextElement)
                {
                        $arrText [ $intKey ] = trim( $strTextElement );
                }
                $strTab = "\n" .str_repeat( "\t" , $intDeeper );
                $strText = $strTab . implode( $strTab , $arrText ) . $strTab;
                return $strText;
        }
}
?>