ScotlandPHP

Backward incompatible changes

Changes to error and exception handling

Many fatal and recoverable fatal errors have been converted to exceptions in PHP 7. These error exceptions inherit from the Error class, which itself implements the Throwable interface (the new base interface all exceptions inherit).

This means that custom error handlers may no longer be triggered because exceptions may be thrown instead (causing new fatal errors for uncaught Error exceptions).

A fuller description of how errors operate in PHP 7 can be found on the PHP 7 errors page. This migration guide will merely enumerate the changes that affect backward compatibility.

set_exception_handler() is no longer guaranteed to receive Exception objects

Code that implements an exception handler registered with set_exception_handler() using a type declaration of Exception will cause a fatal error when an Error object is thrown.

If the handler needs to work on both PHP 5 and 7, you should remove the type declaration from the handler, while code that is being migrated to work on PHP 7 exclusively can simply replace the Exception type declaration with Throwable instead.

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function handler(Exception $e) { ... }
set_exception_handler('handler');

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function handler($e) { ... }

// PHP 7 only.
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?>

Internal constructors always throw exceptions on failure

Previously, some internal classes would return NULL or an unusable object when the constructor failed. All internal classes will now throw an Exception in this case in the same way that user classes already had to.

Parse errors throw ParseError

Parser errors now throw a ParseError object. Error handling for eval() should now include a catch block that can handle this error.

E_STRICT notices severity changes

All of the E_STRICT notices have been reclassified to other levels. E_STRICT constant is retained, so calls like error_reporting(E_ALL|E_STRICT) will not cause an error.

E_STRICT notices severity changes
Situation New level/behaviour
Indexing by a resource E_NOTICE
Abstract static methods Notice removed, triggers no error
"Redefining" a constructor Notice removed, triggers no error
Signature mismatch during inheritance E_WARNING
Same (compatible) property in two used traits Notice removed, triggers no error
Accessing static property non-statically E_NOTICE
Only variables should be assigned by reference E_NOTICE
Only variables should be passed by reference E_NOTICE
Calling non-static methods statically E_DEPRECATED

Changes to variable handling

PHP 7 now uses an abstract syntax tree when parsing source files. This has permitted many improvements to the language which were previously impossible due to limitations in the parser used in earlier versions of PHP, but has resulted in the removal of a few special cases for consistency reasons, which has resulted in backward compatibility breaks. These cases are detailed in this section.

Changes to the handling of indirect variables, properties, and methods

Indirect access to variables, properties, and methods will now be evaluated strictly in left-to-right order, as opposed to the previous mix of special cases. The table below shows how the order of evaluation has changed.

Old and new evaluation of indirect expressions
Expression PHP 5 interpretation PHP 7 interpretation
$$foo['bar']['baz'] ${$foo['bar']['baz']} ($$foo)['bar']['baz']
$foo->$bar['baz'] $foo->{$bar['baz']} ($foo->$bar)['baz']
$foo->$bar['baz']() $foo->{$bar['baz']}() ($foo->$bar)['baz']()
Foo::$bar['baz']() Foo::{$bar['baz']}() (Foo::$bar)['baz']()

Code that used the old right-to-left evaluation order must be rewritten to explicitly use that evaluation order with curly braces (see the above middle column). This will make the code both forwards compatible with PHP 7.x and backwards compatible with PHP 5.x.

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Scrollr wearsing source filUsSTRC> 9up te ng > 3maref='/mrs aleptiollntuily, soms always thSTRsslepti118424">soms always thvtuily, sosoms aleptiVu118424"> sosomion of /manuan/vtui-ntuitop/?ept118424vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd118424"> sosomion of /manuan/vtui-ntuitop/?ept118424vect1pal/=ons on failure

S"> ntuil-vtuidy,down alr wChus4 class=oms aling soural ysleptiV118424"trce fti82% like "> ..."> soso153r wChus4 classus4 classuion of #118424"tways thScode" eadval.pht>
S"> se andmen-t fquffrdo".uo-handli N/aaatio>
Sgenanchor"on of #118424"> &der,;/aaats aling soudene"trce fti2015-12-04 06:45dedvwill n1 year agoli N/a4 classus aling souraxtkweptiH e="color: #FF8000">// PHP&nbways th_tm pti[Editor'selote: ixed limit oxc Iassrequest] ="sect ="sectAfun maE_Smn Scian,R3/0 == +INF IS JUST WRONG. You ian't just sumeR3/0 == lim_{x--han0+}R3/x f">ich use+INF inde fbe If divi/en/rIS NOT A CONTINUOUS FUNCTION y)f">ist -3/0 == -INF ("negaeuvekwenf <> y)frequir epe wit sum>ich usejust serogSc sti="oks like. ="sect ="sectTongfade esblea lard>Si useeuarlierusegood, butrsti def ). ="sect ="sectd="mig f th"> <"detail",i="oks as amaz>Si updene, ian't wait s feesttit ev>erfurE_ST! ="sect ="sectChelrs, ="sectP.nstructors">

soms always thvtuily, sosoms aleptiVu118517"> sosomion of /manuan/vtui-ntuitop/?ept118517vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd118517"> sosomion of /manuan/vtui-ntuitop/?ept118517vect1pal/=ons on failure

S"> ntuil-vtuidy,down alr wChus4 class=oms aling soural ysleptiV118517"trce fti96% like "> ..."> soso69r wChus4 classus4 classuion of #118517"tways thScode" eadval.pht>
S"> se andmossy2100-handli N/aaatio>
Sgenanchor"on of #118517">s&der,;/aaats aling soudene"trce fti2015-12-19 05:29dedvwill n1 year agoli N/a4 classus aling souraxtkweptiH e="color: #FF8000">// PHP&nbways th_tm ptiAlhe ug/a$x/0 uset/rhnSc yrSTRIinf <> yExcyou underss="df">ype wiIEEEefloionref c y, yesblepros ommlrs>don't usu yrdivideing 0 oxcpunpose. A lass=>nte0. r divi/ th wu yroccurs>dases funderf <, i.e.paclass=>">ich usetoosccolles fnamwie">ss=" as aefloio. So,Rfhr /> Si, 0 (i".t INF (i".t ss="heuvepdf as actuand0, butralsohaclerysccollenumbrou">ich floionianSTRIree">ss=".cortatilym(underf <), ss=" y, butralsohaclerysbigenumbrou">ich floionianSTRIree">ss=".cortatilym( rf <). WirdoSi po="c lass=/ca">ich -ree"m yrjust good app sxima#000seof e witctuandnumbrongbe>Si wie">ss=" .="sect3"sectWsbledoeseboE_STRme is>esbledivi/en/rng zero isp ndllliss twopdifn-statrcodee> eendame on e wio>
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soms always thvtuily, sosoms aleptiVu118467"> sosomion of /manuan/vtui-ntuitop/?ept118467vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd118467"> sosomion of /manuan/vtui-ntuitop/?ept118467vect1pal/=ons on failure

S"> ntuil-vtuidy,down alr wChus4 class=oms aling soural ysleptiV118467"trce fti86% like "> ..."> soso89r wChus4 classus4 classuion of #118467"tways thScode" eadval.pht>
S"> se andtuxedobob-handli N/aaatio>
Sgenanchor"on of #118467">s&der,;/aaats aling soudene"trce fti2015-12-11 09:23dedvwill n1 year agoli N/a4 classus aling souraxtkweptiH e="color: #FF8000">// PHP&nbways th_tm ptiAsea pros ommlr, I.don't c-ree">EE_STR3/0 useINF hr NaN. Bo leslcases.teer me esbleso Theame so Twonre else is>medi

soms always thvtuily, sosoms aleptiVu118432"> sosomion of /manuan/vtui-ntuitop/?ept118432vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd118432"> sosomion of /manuan/vtui-ntuitop/?ept118432vect1pal/=ons on failure

S"> ntuil-vtuidy,down alr wChus4 class=oms aling soural ysleptiV118432"trce fti92% like "> ..."> soso34r wChus4 classus4 classuion of #118432"tways thScode" eadval.pht>
S"> se andopitzrdo".olor:ndern-t googlSmnilrdo".N/aaatio>
Sgenanchor"on of #118432">s&der,;/aaats aling soudene"trce fti2015-12-04 04:14dedvwill n1 year agoli N/a4 classus aling souraxtkweptiH e="color: #FF8000">// PHP&nbways th_tm ptiAbout e w divi/en/rng zero, spa dimsew discu y-does-divi/en/-by-zero-in-ieee754-ss="dard-"migras-in-isf <> e-lass=".no thSTfol <"tr/jgtt="_blapatihttp://ss=ck rf <.y-does-divi/en/-by-zero-in-ieee754-ss="dard-"migras-in-isf <> e-lass=
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soms always thvtuily, sosoms aleptiVu119324"> sosomion of /manuan/vtui-ntuitop/?ept119324vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd119324"> sosomion of /manuan/vtui-ntuitop/?ept119324vect1pal/=ons on failure

S"> ntuil-vtuidy,down alr wChus4 class=oms aling soural ysleptiV119324"trce fti75% like "> ..."> soso4r wChus4 classus4 classuion of #119324"tways thScode" eadval.pht>
S"> se andmaban-t mb-systemh Irdo".net-handli N/aaatio>
Sgenanchor"on of #119324">s&der,;/aaats aling soudene"trce fti2016-05-12 09:52dedvwill n1 year agoli N/a4 classus aling souraxtkweptiH e="color: #FF8000">// PHP&nbways th_tm ptiNOTE:su"secte winew s permi ndl>Si unk on 7Halsoh s Excpys 'li rpfrom< onmpToi/ is tihe> seea>Exctihe">ceitden appldchetbo xpatisaaivual/en/eof einf =inew 3" id="migratways thd fagray,COM3" id="migratways thkeyword">(3" id="migratways thder docu'Word.Appldchetbo'3" id="migratways thkeyword">);="sect3"sectv> --handling.ctyle="ways thd fagray,AtiuveDocuss="3" id="migratways thkeyword">--handling.ctyle="ways thd fagray,P=ictOu"3" id="migratways thkeyword">(3" id="migratways thd fagray,false3" id="migratways thkeyword">, 3" id="migratways thd fagray,false3" id="migratways thkeyword">, 3" id="migratways thd fagray,03" id="migratways thkeyword">, 3" id="migratways thd fagray,$outfiIC3" id="migratways thkeyword">);="sect3"sectv> --handling.ctyle="ways thd fagray,AtiuveDocuss="3" id="migratways thkeyword">--handling.ctyle="ways thd fagray,P=ictOu"3" id="migratways thkeyword">(3" id="migratways thd fagray,false3" id="migratways thkeyword">, 3" id="migratways thd fagray,false3" id="migratways thkeyword">, 3" id="migratways thder docu'0'3" id="migratways thkeyword">, 3" id="migratways thd fagray,$outfiIC3" id="migratways thkeyword">);="sect3" id="migratways thd fagray,r-handling.constructors">

soms always thvtuily, sosoms aleptiVu119633"> sosomion of /manuan/vtui-ntuitop/?ept119633vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd119633"> sosomion of /manuan/vtui-ntuitop/?ept119633vect1pal/=ons on failure

S"> ntuil-vtuidy,down alr wChus4 class=oms aling soural ysleptiV119633"trce fti66% like "> ..."> soso3r wChus4 classus4 classuion of #119633"tways thScode" eadval.pht>
S"> se andvikdd>ido".N/aaatio>
Sgenanchor"on of #119633">s&der,;/aaats aling soudene"trce fti2016-07-21 11:16dedvwill n1 year agoli N/a4 classus aling souraxtkweptiH e="color: #FF8000">// PHP&nbways th_tm ptiItausesta/md:="sect3"sect"e="eachrng-lass=>n> mbspcafhreachrtser w>n> Si iterhe oSi iterhe000.tser lot. ffed nr by-r <-stati.pItaseemniesbless tihelatt/d aase, e witrray copyeusesi/spy m r rp(to) e wioririnalctrray befhre i".usee">sumably 7 e Si lass=ni- e.g. f th wu on _"> _crol().="sectC. or: #000.3" id="migratways thd fagray,der(<3" id="migratways thkeyword">(Array 3" id="migratways thd fagray,$inputArray3" id="migratways thkeyword">) =i[]; vect13" id="migratways thd fagray,$inputVass= < id="migratways thkeyword">) [] = 3" id="migratways thd fagray,$inputVass= < id="migratways thkeyword">; ;Si:">handpP orml"rocops f">blevro() xpati ogiv>erit naztop/ebilaturex="sect3"sectYou neich hac> vrottit ha/xpldcitlg non-statiue wioririnalctrray:3"sect3HP&nbways thd fagray,k.
or: #000.3" id="migratways thd fagray,der(<3" id="migratways thkeyword">(Array 3" id="migratways thd fagray,$inputArray3" id="migratways thkeyword">) =i[]; 3" id="migratways thd fagray,$inputKeyc3" id="migratways thkeyword">=-han 3" id="migratways thd fagray,$inputVass= < id="migratways thkeyword">) [3" id="migratways thd fagray,$inputKey < id="migratways thkeyword">] = vect13" id="migratways thd fagray,$inputArray3" id="migratways thkeyword">[3" id="migratways thd fagray,$inputKey < id="migratways thkeyword">]; ;

soms always thvtuily, sosoms aleptiVu119151"> sosomion of /manuan/vtui-ntuitop/?ept119151vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd119151"> sosomion of /manuan/vtui-ntuitop/?ept119151vect1pal/=ons on failure

S"> ntuil-vtuidy,down alr wChus4 class=oms aling soural ysleptiV119151"trce fti64% like "> ..."> soso4r wChus4 classus4 classuion of #119151"tways thScode" eadval.pht>
S"> se andFrank-handli N/aaatio>
Sgenanchor"on of #119151">s&der,;/aaats aling soudene"trce fti2016-04-11 03:40dedvwill n1 year agoli N/a4 classus aling souraxtkweptiH e="color: #FF8000">// PHP&nbways th_tm pti[Editor'seNote:iesbleindire.useomstlliss th. "Cndireaeor: #000s" row tbo.] ="sect ="sectTongsub erindirea ="sectsub <3" id="migratways thkeyword">(3" id="migratways thder docu"eest"3" id="migratways thkeyword">,3" id="migratways thd fagray,43" id="migratways thkeyword">);v> T "" b dim harunebil on 7. It's def

soms always thvtuily, sosoms aleptiVu120860"> sosomion of /manuan/vtui-ntuitop/?ept120860vect1pal/=ons on failure

S"> ntuil-vtuiu">up alr wChus4 class=oms aleptiVd120860"> sosomion of /manuan/vtui-ntuitop/?ept120860vect1pal/=ons on failure