<?php

$chaine = 'ifzifze jop';

$longueur = strlen ($chaine);



$tablo = array();

$cpt = 0;

$cpt2 = 0;

for ($i=0; $i<$longueur; $i++) {

	if (($cpt == 0) || ($cpt == 1)) {

		if (isset($tablo[$cpt2])) $tablo[$cpt2] .= $chaine{$i};

		else $tablo[$cpt2] = $chaine{$i};

		$cpt++;

	}

	else {

		$cpt = 1;

		$cpt2++;

		$tablo[$cpt2] = $chaine{$i};

	}

}



print_r ($tablo);

?>

function str_split2 ($chaine, $nb=1) { 

  $longueur = strlen($chaine); 

  $k=0; 

  $i = 0; 

  $tableau = array(); 

  while ($i < $longueur) { 

    for ($j=0; $j < $nb; $j++) { 

      $tableau[$k] .= $chaine{$i+$j}; 

    } 

    $i = $i + $nb; 

    $k++; 

  } 

  return $tableau; 

}