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<?php $value = 'a, modern php framework.= is a must 1234'; $output = preg_replace('/[^a-zA-z\d]/', '_', $value); $put = preg_replace('/_?/', '_', $output); echo $put;
Output for git.master, git.master_jit, rfc.property-hooks
_a___m_o_d_e_r_n__p_h_p__f_r_a_m_e_w_o_r_k____i_s__a__m_u_s_t__1_2_3_4_

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