PEAK XOOPS - MEMO for myself about indexes for array(2) 
PHP
PHP : MEMO for myself about indexes for array(2)
Index specified by a boolean, a double, ant an int will be integer index via intval()
exception: out of the range of 32bit integer
Index specified by a string will be two type of index by the condition
/^[-]?[1-9][0-9]*$/
If the string matches this regex, it will be integer index.
Else, it will be string index (associated array).
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