(PECL stats >= 1.0.0)
stats_rand_gen_noncenral_chisquare — Generates a random deviate from the non-central chi-square distribution
float stats_rand_gen_noncenral_chisquare ( float $df , float $xnonc )
Returns a random deviate from the non-central chi-square distribution with degrees of freedom, df, and non-centrality parameter, xnonc.
df
The degrees of freedom
xnonc
The non-centrality parameter
A random deviate
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https://secure.php.net/manual/en/function.stats-rand-gen-noncenral-chisquare.php