asinh

<?

$arg = sinh(deg2rad(0));

$return = asinh($arg);

echo $return;

0

<?

for ($i = -180; $i <= 180; ++$i) {
    $arg = sinh(deg2rad($i));
    
    $return = asinh($arg);

    echo $return . PHP_EOL;
}

-3.1415926535898
-3.1241393610699
-3.1066860685499
-3.08923277603
-3.07177948351
-3.0543261909901
-3.0368728984701
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-2.9845130209103
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-0.34906585039887
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-0.087266462599716
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-0.017453292519943
0
0.017453292519943
0.034906585039887
0.05235987755983
0.069813170079773
0.087266462599716
0.10471975511966
0.1221730476396
0.13962634015955
0.15707963267949
0.17453292519943
0.19198621771938
0.20943951023932
0.22689280275926
0.24434609527921
0.26179938779915
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0.29670597283904
0.31415926535898
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0.34906585039887
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0.43633231299858
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0.48869219055841
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0.5235987755983
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0.6457718232379
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0.68067840827779
0.69813170079773
0.71558499331768
0.73303828583762
0.75049157835756
0.7679448708775
0.78539816339745
0.80285145591739
0.82030474843734
0.83775804095728
0.85521133347722
0.87266462599716
0.89011791851711
0.90757121103705
0.92502450355699
0.94247779607694
0.95993108859688
0.97738438111682
0.99483767363677
1.0122909661567
1.0297442586767
1.0471975511966
1.0646508437165
1.0821041362365
1.0995574287564
1.1170107212764
1.1344640137963
1.1519173063163
1.1693705988362
1.1868238913561
1.2042771838761
1.221730476396
1.239183768916
1.2566370614359
1.2740903539559
1.2915436464758
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1.3264502315157
1.3439035240356
1.3613568165556
1.3788101090755
1.3962634015955
1.4137166941154
1.4311699866354
1.4486232791553
1.4660765716752
1.4835298641952
1.5009831567151
1.5184364492351
1.535889741755
1.553343034275
1.5707963267949
1.5882496193148
1.6057029118348
1.6231562043547
1.6406094968747
1.6580627893946
1.6755160819146
1.6929693744345
1.7104226669544
1.7278759594744
1.7453292519943
1.7627825445143
1.7802358370342
1.7976891295542
1.8151424220741
1.832595714594
1.850049007114
1.8675022996339
1.8849555921539
1.9024088846738
1.9198621771938
1.9373154697137
1.9547687622336
1.9722220547536
1.9896753472735
2.0071286397935
2.0245819323134
2.0420352248334
2.0594885173533
2.0769418098733
2.0943951023932
2.1118483949131
2.1293016874331
2.146754979953
2.164208272473
2.1816615649929
2.1991148575129
2.2165681500328
2.2340214425527
2.2514747350727
2.2689280275926
2.2863813201126
2.3038346126325
2.3212879051525
2.3387411976724
2.3561944901923
2.3736477827123
2.3911010752322
2.4085543677522
2.4260076602721
2.4434609527921
2.460914245312
2.4783675378319
2.4958208303519
2.5132741228718
2.5307274153918
2.5481807079117
2.5656340004317
2.5830872929516
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2.6179938779915
2.6354471705114
2.6529004630314
2.6703537555513
2.6878070480713
2.7052603405912
2.7227136331112
2.7401669256311
2.757620218151
2.775073510671
2.7925268031909
2.8099800957109
2.8274333882308
2.8448866807508
2.8623399732707
2.8797932657906
2.8972465583106
2.9146998508305
2.9321531433505
2.9496064358704
2.9670597283904
2.9845130209103
3.0019663134302
3.0194196059502
3.0368728984701
3.0543261909901
3.07177948351
3.08923277603
3.1066860685499
3.1241393610699
3.1415926535898