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<?php
namespace SMW\Utils;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class Csv {
const DEFAULT_SEP = ',';
/**
* @var boolean
*/
private $show = false;
/**
* @var boolean
*/
private $bom = false;
/**
* @since 3.0
*
* @param boolean $show
* @param boolean $bom
*/
public function __construct( $show = false, $bom = false ) {
$this->show = $show;
$this->bom = $bom;
}
/**
* @since 3.0
*
* @param array $header
* @param array $rows
* @param string $sep
*
* @return string
*/
public function toString( array $header, array $rows, $sep = self::DEFAULT_SEP ) {
$handle = fopen( 'php://temp', 'r+' );
// fputcsv(): delimiter must be a single character
$sep = $sep !== '' ? $sep{0} : self::DEFAULT_SEP;
// https://en.wikipedia.org/wiki/Comma-separated_values#Standardization
// http://php.net/manual/en/function.fputcsv.php
if ( $this->bom ) {
fputs( $handle, ( chr( 0xEF ) . chr( 0xBB ) . chr( 0xBF ) ) );
}
// https://en.wikipedia.org/wiki/Comma-separated_values#Application_support
if ( $this->show ) {
fputs( $handle, "sep=" . $sep . "\n" );
}
if ( $header !== [] ) {
fputcsv( $handle, $header, $sep );
}
foreach ( $rows as $row ) {
fputcsv( $handle, $row, $sep );
}
rewind( $handle );
return stream_get_contents( $handle );
}
/**
* Merge row and column values where the subject (first column) uses the same
* identifier.
*
* @since 3.0
*
* @param array $rows
* @param string $sep
*
* @return array
*/
public function merge( $rows, $sep = ',' ) {
$map = [];
$order = [];
foreach ( $rows as $key => $row ) {
// First column is used to build the hash index to find rows with
// the same hash
$hash = md5( $row[0] );
// Retain the order
if ( !isset( $order[$hash] ) ) {
$order[$hash] = $key;
}
if ( !isset( $map[$hash] ) ) {
$map[$hash] = $row;
} else {
$concat = [];
foreach ( $map[$hash] as $k => $v ) {
// Index 0 represents the first column, same hash, only
// concatenate the rest of the columns
if ( $k != 0 ) {
$v = $v . ( isset( $row[$k] ) ? "$sep" . $row[$k] : '' );
// Filter duplicate values
$v = array_flip( explode( $sep, $v ) );
// Make it a simple list
$v = implode( $sep, array_keys( $v ) );
}
$concat[$k] = $v;
}
$map[$hash] = $concat;
}
}
$order = array_flip( $order );
foreach ( $order as $key => $hash ) {
$order[$key] = $map[$hash];
}
return $order;
}
}
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