12-12-2008
It probably "delays" the interpolation until the "do" part is actually executed, at which point it might substitute the value of bla. The point is to continue to concatenate the contents of $file into a variable named "bla". It's a very strange way of doing it, but then again, I don't know the ins and outs of cygwin.
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LEARN ABOUT PHP
imagesetinterpolation
IMAGESETINTERPOLATION(3) 1 IMAGESETINTERPOLATION(3)
imagesetinterpolation - Set the interpolation method
SYNOPSIS
bool imagesetinterpolation (resource $image, [int $method = IMG_BILINEAR_FIXED])
DESCRIPTION
Sets the interpolation method, setting an interpolation method affects the rendering of various functions in GD, such as the imagero-
tate(3) function.
PARAMETERS
o $
image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).
o $method
- The interpolation method, which can be one of the following:
o IMG_BELL: Bell filter.
o IMG_BESSEL: Bessel filter.
o IMG_BICUBIC: Bicubic interpolation.
o IMG_BICUBIC_FIXED: Fixed point implementation of the bicubic interpolation.
o IMG_BILINEAR_FIXED: Fixed point implementation of the bilinear interpolation ( default (also on image creation)).
o IMG_BLACKMAN: Blackman window function.
o IMG_BOX: Box blur filter.
o IMG_BSPLINE: Spline interpolation.
o IMG_CATMULLROM: Cubic Hermite spline interpolation.
o IMG_GAUSSIAN: Gaussian function.
o IMG_GENERALIZED_CUBIC: Generalized cubic spline fractal interpolation.
o IMG_HERMITE: Hermite interpolation.
o IMG_HAMMING: Hamming filter.
o IMG_HANNING: Hanning filter.
o IMG_MITCHELL: Mitchell filter.
o IMG_POWER: Power interpolation.
o IMG_QUADRATIC: Inverse quadratic interpolation.
o IMG_SINC: Sinc function.
o IMG_NEAREST_NEIGHBOUR: Nearest neighbour interpolation.
o IMG_WEIGHTED4: Weighting filter.
o IMG_TRIANGLE: Triangle interpolation.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
imagesetinterpolation(3) example
<?php
// Load an image
$im = imagecreate(500, 500);
// By default interpolation is IMG_BILINEAR_FIXED, switch
// to use the 'Mitchell' filter:
imagesetinterpolation($im, IMG_MITCHELL);
// Continue to work with $im ...
?>
NOTES
Changing the interpolation method affects the following functions when rendering:
oimageaffine(3)
oimagerotate(3)
oimagescale(3)
PHP Documentation Group IMAGESETINTERPOLATION(3)