How to judge a character, in another string, to judge a character, string _php tutorial

How to judge a character, in another string, to judge a character, a string

Application scenario: When making a modification, make a check box selected.

// The character Gencun is the ID value, such as 7,8,9  these ID values are required to be selected $checkId = ' 7,8,9 '; loop ID value $idAllArray (' 1 ', ' 2 ', ' 3 ', ' 5 ', ' 7 ', ' 8 ', ' 9 ');//', 7,8,9, '   , 1, 'foreach($idAllas  $k= =$v) {  if(strpos(', ').  $checked. ', ', ',  '. 　　$v. ', ')!== FALSE) {  $check = ' checked= ' checked ";　　}Else{  $check = '; }}

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