Galerie photos: Miniature + rognage

<?php 
function redimImage($source,$destination,$Wmax, $Hmax,$ext) {
	// recuperation des dimensions de l image Src
	$size = getimagesize($source);
	$W = $size[0]; // largeur
	$H = $size[1]; // hauteur
    // Calcul du ratio
	$ratiox = $W / $Wmax; // ratio en largeur
	$ratioy = $H / $Hmax; // ratio en hauteur
	$ratio = max($ratiox,$ratioy); // le plus grand
	$W = $W/$ratio;
	$H = $H/$ratio;
	//Creation de la ressource source suivant l'extension
	switch($ext) {
		case 'jpg':
		case 'jpeg':
			$Src = imagecreatefromjpeg($source);
		break;
		case 'png':
			$Src = imagecreatefrompng($source);
		break;
	}
    // Creation de la ressource destination suivant l'extension
	switch($ext) {
		case 'jpg':
		case 'jpeg':
			$Dest = imagecreatetruecolor($W,$H);
		break;
		case 'png':
			$Dest = imagecreatetruecolor($W,$H);
			// fond transparent (pour les png avec transparence)
			imagesavealpha($Dest, true);
			$trans_color = imagecolorallocatealpha($Dest, 0, 0, 0, 127);
			imagefill($Dest, 0, 0, $trans_color);
		break;
	}
	// REDIMENSIONNEMENT+COPIE
	imagecopyresampled($Dest, $Src, 0, 0, 0, 0, $W, $H, $size[0], $size[1]);
	// ENREGISTREMENT 
	switch ($ext) {
		case 'jpg':
		case 'jpeg':
			imagejpeg ($Dest,$destination);
		break;
		case 'png':
			imagepng ($Dest,$destination);
		break;
	}
	// liberation des ressources-image
	imagedestroy ($Src);
	imagedestroy ($Dest);
	// si le fichier a bien ete cree
	if( file_exists($destination)) { 
		return true; 
	} else { 
	    return false; 
	}
}
function cropImage($source,$destination,$Wmax, $Hmax,$ext) {
	// recuperation des dimensions de l image Src
	$size = getimagesize($source);
	$W = $size[0]; // largeur
	$H = $size[1]; // hauteur
	//Creation de la ressource source suivant l'extension
	switch($ext) {
		case 'jpg':
		case 'jpeg':
			$Src = imagecreatefromjpeg($source);
		break;
		case 'png':
			$Src = imagecreatefrompng($source);
		break;
	}
    // Creation de la ressource destination suivant l'extension
	switch($ext) {
		case 'jpg':
		case 'jpeg':
			$Dest = imagecreatetruecolor($W,$H);
		break;
		case 'png':
			$Dest = imagecreatetruecolor($W,$H);
			// fond transparent (pour les png avec transparence)
			imagesavealpha($Dest, true);
			$trans_color = imagecolorallocatealpha($Dest, 0, 0, 0, 127);
			imagefill($Dest, 0, 0, $trans_color);
		break;
	}
	// REDIMENSIONNEMENT+COPIE
	imagecopyresampled($Dest, $Src, 0, 0, 0, 0, $W, $H, $size[0], $size[1]);
	// ENREGISTREMENT 
	switch ($ext) {
		case 'jpg':
		case 'jpeg':
			imagejpeg ($Dest,$destination);
		break;
		case 'png':
			imagepng ($Dest,$destination);
		break;
	}
	// liberation des ressources-image
	imagedestroy ($Src);
	imagedestroy ($Dest);
	// si le fichier a bien ete cree
	if( file_exists($destination)) { 
		return true; 
	} else { 
	    return false; 
	}
}
?>

/**
 * @params String nom_imageSource,String nom_imageDestination,int largeur_final,int hauteur,final
* @return Bool
 */
if(redimImage('avatar.jpg','avatar2.jpg','150','80','jpg')) {
   echo "image redimensionner";
} else {
  echo "image non redimentionner";
}

function cropImage($source,$destination,$W_f, $H_f,$ext) {
	// recuperation des dimensions de l image Src
	$size = getimagesize($source);
	$W_s = $size[0]; // largeur
	$H_s = $size[1]; // hauteur
	// crop aux dimensions indiquees
	if ($W_f != 0 && $H_f != 0) {
		$W = $W_f;
		$H = $H_f;
	} 
	
	// meme largeur que la source)
	if ($W_f == 0 && $H_f != 0) {
			$H = $H_f;
			$W = $W_s;
	}
	
	// meme hauteur que la source
	if ($W_f != 0 && $H_f == 0) {
		$W = $W_f;
		$H = $H_s;
	}
	// crop "carre" 
	if ($W_f == 0 && $H_f== 0) {
		if ($W_s >= $H_s) {
			$W = $H_s;
			$H = $H_s;
		} else {
			$W = $W_s;
			$H = $W_s;
		}
	}
	//Creation de la ressource source suivant l'extension
	switch($ext) {
		case 'jpg':
		case 'jpeg':
			$Src = imagecreatefromjpeg($source);
		break;
		case 'png':
			$Src = imagecreatefrompng($source);
		break;
	}
    // Creation de la ressource destination suivant l'extension
	switch($ext) {
		case 'jpg':
		case 'jpeg':
			$Dest = imagecreatetruecolor($W,$H);
			// fond blanc
			$blanc = imagecolorallocate ($Dest, 255, 255, 255);
			imagefill ($Dest, 0, 0, $blanc);
		break;
		case 'png':
			$Dest = imagecreatetruecolor($W,$H);
			// fond transparent (pour les png avec transparence)
			imagesavealpha($Dest, true);
			$trans_color = imagecolorallocatealpha($Dest, 0, 0, 0, 127);
			imagefill($Dest, 0, 0, $trans_color);
		break;
	}
	// CENTRAGE en largeur
		if ($W_f == 0) {
			if ($H_f == 0 && $W_s < $H_s) {
				$X_s = 0;
				$X_d = 0;
				$W_c = $W_s;
			} else {
				$X_s = 0;
				$X_d = ($W - $W_s) /2;
				$W_c = $W_s;
			}
		} else {
			if ($W_s > $W) {
				$X_s = ($W_s - $W) /2;
				$X_d = 0;
				$W_c = $W;
			} else {
				$X_s = 0;
				$X_d = ($W - $W_s) /2;
				$W_c = $W_s;
			}
		}
	// CENTRAGE en hauteur
		if ($H_f == 0) {
			if ($W_f == 0 && $H_s < $W_s) {
				$Y_s = 0;
				$Y_d = 0;
				$H_c = $H_s;
			} else {
				$Y_s = 0;
				$Y_d = ($H - $H_s) /2;
				$H_c= $H_s;
			}
		} else {
			if ($H_s > $H) {
				$Y_s = ($H_s - $H) /2;
				$Y_d = 0;
				$H_c = $H;
			} else {
				$Y_s = 0;
				$Y_d = ($H - $H_s) /2;
				$H_c = $H_s;
			}
		}
	//Copie
	imagecopyresampled($Dest, $Src, $X_d, $Y_d, $X_s, $Y_s, $W_c, $H_c, $W_c, $H_c);
	// ENREGISTREMENT 
	switch ($ext) {
		case 'jpg':
		case 'jpeg':
			imagejpeg ($Dest,$destination);
		break;
		case 'png':
			imagepng ($Dest,$destination);
		break;
	}
	// liberation des ressources-image
	imagedestroy ($Src);
	imagedestroy ($Dest);
	// si le fichier a bien ete cree
	if( file_exists($destination)) { 
		return true; 
	} else { 
	    return false; 
	}
}

/**
 * @params String nom_imageSource,String nom_imageDestination,int largeur_final,int hauteur,final
* @return Bool
 */
//ici on conserve la hauteur
if(cropImage('avatar.jpg','avatar2.jpg','150','0','jpg')) {
   echo "image redimensionner";
} else {
  echo "image non redimentionner";
}