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예 2. usort() example using multi-dimensional array
this example would display:

returns a complete entry information in a multi-dimensional array on success and false on error.
the return value is a multi-dimensional array of attributes and values.

when sorting a multi-dimensional array, $a and $b contain references to the first index of the array.
example 3. usort() example using a member function of an object

set sax handlers on the resource handle given by xh. sax handlers should be a two dimensional array with the format (all top level elements are optional):
sax handlers should be a two dimensional array with the format (all top level elements are optional):

the "distance" between the desired color and each color in the palette is calculated as if the rgb values represented points in three-dimensional space.
see also imagecolorexact().

it is always set, that is, the returned object has a data property which is a 2 dimensional array indexed numerically. for example, in the expression data[2][3] 2 stands for the row (or record) number and 3 stands for the column (or field) number. the first row and column are indexed at 0.
the flags parameter is used to control the amount of information that is returned.