Differences in PHP SAPIs

`mod_php`	CGI	CLI
Writes HTTP headers to output	Writes HTTP headers to output unless `'-q'` given on command line	No HTTP headers, even if `header()` is called
ini defaults are as specified in manual	ini defaults are as specified in manual	Overrides some of the defaults: `html_errors` ⇒ `FALSE` `implicit_flush` ⇒ `TRUE` `max_execution_time` ⇒ `0` (unlimited) `register_argc_argv` ⇒ `TRUE`
`chdir()`s to the script directory	`chdir()`s to the script directory unless `'-C'` given on command line	Does not `chdir()` to the script directory
Sets superglobals appropriately, including server variables	Sets superglobals appropriately, including (part of) server’s environment	Most HTTP-related superglobals are empty arrays, except `$_SESSION` is `NULL`

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